説明する

The Japanese verb 説明する (setsumei suru) is a cornerstone of communication, functioning as the primary way to express the act of explaining, describing, or providing an account of something. At its core, it is a compound verb consisting of the noun setsumei (explanation) and the irregular verb suru (to do). Understanding this word requires looking at its kanji: 説 (setsu), which means to talk, explain, or theory, and 明 (mei), which means bright, clear, or light. Together, they literally translate to 'making something clear through speech.' This visual of bringing light to a dark or confusing topic is essential to how Japanese speakers perceive the word.

Core Concept

To bridge the gap between ignorance and understanding by providing logical details or context.

In daily life, you will encounter 説明する in almost every formal and semi-formal setting. It is the word used when a teacher explains a grammar point, when a doctor explains a medical procedure, or when a tech support agent guides you through a software fix. However, it is not just for experts. If a friend asks why you were late, you might say you need to 'explain' the situation. It implies a level of detail and logic that goes beyond a simple 'telling' (iu) or 'teaching' (oshieru). While 'oshieru' is often used for sharing knowledge or skills, 'setsumei suru' is specifically about the process of clarification.

The word also carries a weight of responsibility. In Japanese culture, the burden of explanation often lies with the person proposing an idea or the person who has made a mistake. A 'setsumei-sekinin' (accountability or the responsibility to explain) is a common term in politics and business. When a company has a data leak, the public demands they 'setsumei suru'—not just to state facts, but to provide a logical narrative that satisfies the audience's need for clarity and resolution.

Nuance Note

Unlike 'oshieru' which implies a hierarchy (teacher-student), 'setsumei suru' is more neutral and focuses on the information itself.

Furthermore, the word is versatile in its grammatical attachments. You can explain a 'reason' (riyuu), a 'method' (houhou), a 'meaning' (imi), or even a 'feeling' (kimochi). While feelings are often shared or told, 'setsumei suru' implies you are trying to make the other person logically understand why you feel that way. It is the difference between saying 'I am sad' and 'Let me explain why I am sad.' This logical component makes it an essential tool for conflict resolution and deep academic discussion.

Etymology Insight

The character 説 also appears in 'shousetsu' (novel), implying a story or narrative structure used to convey truth.

In conclusion, 説明する is your go-to verb for any situation where clarity is the goal. It bridges the gap between complex data and human understanding. Whether you are navigating a new city, learning a new language, or working in a Japanese office, mastering the use of this verb—and its various forms like 'setsumei shite kudasai' (please explain)—is vital for effective communication.

Using 説明する (setsumei suru) correctly involves understanding its transitivity and the particles that typically accompany it. As a transitive verb, it usually takes an object marked by the particle を (wo). This object is the thing being explained. For example, 'rule-wo setsumei suru' (explain the rules). If you are explaining *to* someone, that person is marked with the particle に (ni). This creates the standard pattern: [Person] に [Topic] を 説明する.

Standard Pattern

[Target Person] に [Information] を 説明する

Because setsumei suru is a Suru-verb, it follows all the standard conjugations of suru. In polite speech, it becomes setsumei shimasu. In the past tense, it is setsumei shimashita. For requests, you might use setsumei shite kudasai (please explain) or the more humble setsumei sasete itadakimasu (allow me to explain). This versatility allows it to fit into any social hierarchy, which is crucial in Japanese society.

One interesting grammatical feature is how it interacts with question words. When you want to say 'explain how to...' or 'explain why...', you often use the dictionary form of a verb followed by 方法 (houhou - method) or 理由 (riyuu - reason), or use a noun clause with か (ka). For instance, 'doushite okureta ka setsumei shite' (explain why you were late). This allows for complex sentences that describe the 'what' and 'why' of a situation with precision.

Adverbs frequently modify setsumei suru to indicate the quality of the explanation. Common modifiers include 詳しく (kuwashiku - in detail), 丁寧に (teineini - politely/carefully), 簡単に (kantanni - simply), and 論理的に (ronritekini - logically). Using these adverbs helps specify the depth and tone of the information being shared. For example, 'kantanni setsumei suru' is often used when you want to give a 'TL;DR' or a quick overview before diving into details.

Common Adverbs

詳しく (in detail), 簡潔に (concisely), 分かりやすく (in an easy-to-understand way)

In passive contexts, you might hear setsumei sareru (to be explained). For example, 'Kono riron wa hon de setsumei sarete iru' (This theory is explained in the book). This is common in academic writing where the focus is on the object rather than the person doing the explaining. Additionally, the potential form setsumei dekiru (can explain) is vital for expressing competence. 'I can explain this' (Kore-wo setsumei dekimasu) is a powerful phrase in both exams and job interviews.

Finally, consider the use of the noun form setsumei with other verbs like 求める (motomeru - to seek/demand). 'Setsumei-wo motomeru' is a strong phrase often used in news headlines when the public demands answers from an official. This highlights that setsumei suru is not just a linguistic act, but a social one that involves accountability and the transfer of clarity.

The word 説明する (setsumei suru) is ubiquitous in Japanese society, appearing in contexts ranging from the mundane to the highly specialized. If you walk into a Japanese electronics store (like Yodobashi Camera or Bic Camera), you will inevitably hear staff members saying, 'Kinou-ni tsuite setsumei shimasu' (I will explain the functions). Here, the word acts as a bridge between the customer's curiosity and the product's complexity. It sets a professional tone, signaling that the staff is about to provide expert knowledge.

Retail Context

Staff providing product specifications or warranty details to customers.

In educational settings, from elementary school to university, setsumei suru is the primary verb for instruction. A teacher might say, 'Kore kara tesuto-no yarigata-wo setsumei suru kara, yoku kiite kudasai' (I'm going to explain how to do the test, so please listen carefully). In this environment, the word is associated with authority and the dissemination of essential information. Students are also encouraged to 'setsumei suru' their answers, moving beyond rote memorization to demonstrate true understanding through logical verbalization.

The business world is perhaps where you will hear setsumei suru most frequently. Whether it's a 'setsumeikai' (orientation/briefing), a 'jigyou setsumei' (business plan explanation), or simply a manager explaining a new task, the word is foundational to workplace efficiency. In Japanese business culture, where 'hou-ren-sou' (Report, Contact, Consult) is vital, being able to 'setsumei suru' clearly is a highly valued skill. If a project fails or a deadline is missed, the 'setsumei' provided to superiors must be thorough and logical to be accepted.

In media and entertainment, setsumei suru often appears in news broadcasts and documentaries. News anchors might say, 'Senmonka ni setsumei shite moraimasu' (We will have an expert explain it). Interestingly, in anime and manga, there is a trope called 'setsumei-zerifu' (explanatory dialogue), where a character (often a villain or a wise mentor) explains a complex power system or a plot point directly to the audience or another character. While sometimes criticized for 'telling instead of showing,' it demonstrates how ingrained the concept of 'explanation' is in Japanese narrative structures.

Media Context

Experts on TV news explaining weather patterns, economic shifts, or new laws.

You will also find the word in written form everywhere: 'setsumeisho' (instruction manuals) for furniture, 'shiyou setsumei' (usage instructions) on the back of medicine bottles, and 'goshotsumei' (explanations) in museum exhibits. In these cases, the word ensures safety and proper usage. Even in casual conversation, if you say something confusing, your friend might laugh and say 'Setsumei busoku da yo!' (That's a lack of explanation/You're not explaining enough!), highlighting that even in informal settings, the expectation for clarity remains.

One of the most frequent mistakes English speakers make when using 説明する (setsumei suru) is confusing it with 教える (oshieru). While both can be translated as 'to tell' or 'to inform,' their nuances are quite different. Oshieru is used for teaching a skill (like piano), sharing a piece of information you know (like your phone number), or providing general knowledge. Setsumei suru, on the other hand, is specifically about providing a logical explanation or a detailed description of a process or reason. You 'oshieru' someone your address, but you 'setsumei suru' the directions to get there.

Comparison

教える (Oshieru): To teach/give info.
説明する (Setsumei suru): To clarify/explain logic.

Another common error involves particle usage. Learners often use the particle を (wo) for the person they are explaining to, likely because 'explain someone' might sound vaguely possible in English (though 'explain to someone' is correct). In Japanese, the person receiving the explanation *must* be marked with に (ni). Saying 'Tanaka-san-wo setsumei suru' means you are explaining who Tanaka-san is (treating him as the topic), rather than explaining something *to* him. Always remember: [Person] に [Topic] を 説明する.

Overusing setsumei suru in very casual situations can also sound a bit stiff or overly formal. If you just want to say 'tell me about your trip,' using 'setsumei shite' might sound like you're asking for a formal report. In casual settings, 話す (hanasu - to talk/tell) or 言う (iu - to say) are often more natural. For example, 'Ryokou-no hanashi-wo shite' (Tell me the story of your trip) is friendlier than 'Ryokou-wo setsumei shite.' Reserve setsumei suru for when there is a 'how' or a 'why' that needs clarifying.

A subtle mistake is failing to distinguish between setsumei suru and 紹介する (shoukai suru - to introduce). If you are showing a friend a new app, you might think you are 'explaining' it, but if you are just showing it for the first time, 'shoukai suru' is often better. 'Setsumei' implies you are going into the mechanics of how it works. Similarly, don't confuse it with 表現する (hyougen suru - to express), which is about artistic or emotional expression, not logical clarification.

Confusing Pair

紹介する (Shoukai): Introduction/Presenting.
説明する (Setsumei): Detailed logical breakdown.

Lastly, learners sometimes forget that setsumei can be used as a noun. Instead of saying 'setsumei suru no wa muzukashii' (explaining is difficult), it is often more natural to say 'setsumei ga muzukashii' (the explanation is difficult). Using the noun form effectively can make your Japanese sound more sophisticated and concise. Also, be careful with the potential form; 'setsumei dekiru' (can explain) is common, but 'setsumei sareru' (to be explained) should be used carefully to avoid sounding like you are avoiding responsibility in a conversation.

While 説明する (setsumei suru) is the most versatile word for 'explaining,' Japanese offers several alternatives that carry specific nuances depending on the context, formality, and the nature of the information being shared. Understanding these can help you transition from a basic speaker to a more nuanced one. One of the closest synonyms is 解説する (kaisetsu suru). While setsumei is general, kaisetsu often refers to commentary, analysis, or an expert's explanation of a complex topic, like a sports commentator or a literary critic.

Setsumei vs. Kaisetsu

説明 (Setsumei): General explanation of facts/methods.
解説 (Kaisetsu): Expert commentary or deep analysis of a subject.

For more formal or academic contexts, you might encounter 述べる (noberu). This verb means 'to state' or 'to mention' and is frequently used in written reports or formal speeches. It doesn't necessarily imply the 'clarification' aspect of setsumei, but rather the formal act of putting thoughts into words. Similarly, 講義する (kougi suru) specifically refers to giving a lecture, usually in a university setting. If you are 'explaining' something for 90 minutes to a room of students, you are 'kougi-ing.'

When the explanation involves telling a story or a sequence of events, 語る (kataru) or 話す (hanasu) might be more appropriate. Kataru has a slightly more poetic or narrative feel, often used for telling tales, myths, or personal experiences with emotional weight. If you are explaining your life story, kataru is much more evocative than the clinical setsumei suru. For simple reporting of facts, 報告する (houkoku suru) is used, especially in business (e.g., reporting progress on a project).

In technical fields, you might see 描写する (byousha suru), which means 'to depict' or 'to describe' visually or vividly. While setsumei focuses on the logic, byousha focuses on the imagery. If you are describing the appearance of a crime suspect, you are 'byousha-ing' them. Another specialized term is 釈明する (shakumei suru), which is a formal way to 'explain oneself' or 'vindicate' after a misunderstanding or an error, often used by public figures in scandals.

Specialized Alternatives

描写 (Byousha): Visual description.
釈明 (Shakumei): Formal vindication/explanation of a mistake.

Finally, in very casual speech, you might use 言い聞かせる (iikikaseru), which means to 'tell and make understand,' often used when explaining something to a child or someone who is being stubborn. It carries a sense of persuasion. By choosing the right word—whether it's the expert kaisetsu, the formal noberu, or the narrative kataru—you can convey your message with much greater precision than by relying on setsumei suru alone.