留守にする

The Japanese phrase 留守にする (rusu ni suru) is a foundational expression for anyone navigating daily life in Japan, particularly at the CEFR B1 level where communicative competence in routine situations becomes essential. At its core, the phrase translates to 'to be away from home' or 'to be out.' However, the linguistic journey of this word is fascinating. The kanji 留 (ru) means to stay or to detain, and 守 (su) means to protect or to guard. Historically, rusu referred to the act of staying behind to guard a house while the master or the family was away. Over time, the meaning underwent a semantic shift known as metonymy, where the word for the person 'staying behind' began to represent the 'absence' of the primary residents themselves. Today, when you say you are going to rusu ni suru, you are focusing on the state of the home being empty or your own absence from that space.

Core Meaning

The state of not being present at one's usual place of residence or work, often implying that the space is left unattended.

In contemporary Japanese society, this phrase is used in a variety of contexts, ranging from casual family discussions about weekend plans to formal notifications for neighbors or delivery services. It is important to distinguish between the noun rusu (absence) and the verbal construction rusu ni suru (to make it an absence / to be out). When you use the verb form, you are often describing a planned or intentional period of time during which you will not be at home. For example, if you are going on a business trip for three days, you would say you are going to rusu ni suru for that duration. This phrase carries a specific weight in Japan because of the cultural emphasis on 'aisatsu' (greetings) and community awareness; knowing if a neighbor's house is 'rusu' is part of the traditional communal safety net.

Furthermore, the concept of rusu extends into technology and services. The common term for an answering machine is rusuban denwa (留守番電話), literally the 'stay-behind-guarding phone.' When a delivery driver arrives and you are not there, they will leave a fuzai-hyo (不在票), but in conversation, you might say 'I was rusu' to explain why you missed the package. Interestingly, there is also the phrase rusu wo tsukau (留守を使う), which means to pretend to be out when you are actually home—a useful social tactic for avoiding unwanted visitors. Understanding rusu ni suru is not just about learning a verb; it is about understanding how Japanese people conceptualize their physical presence and their responsibilities to their living space.

Social Nuance

Using this phrase often triggers a sense of responsibility to ensure the home is secure or that others are informed of the absence.

To master this word, one must also be aware of its grammatical flexibility. You will often see it paired with time markers like 'aida' (while) or 'kan' (duration). For instance, 'traveling no aida, ie wo rusu ni suru' (to be away from home while traveling). It is a versatile phrase that bridges the gap between simple daily vocabulary and more complex situational Japanese. As you progress to B1, you should move beyond just saying 'inai' (not here) and start using rusu ni suru to sound more natural and precise in your descriptions of your whereabouts.

Using 留守にする (rusu ni suru) correctly requires an understanding of Japanese particle usage and sentence structure. The most common pattern involves the object marker を (wo) to indicate the place being left empty, usually ie (house) or taku (home). The structure typically looks like: [Place] + を + [Duration] + 留守にする. For example, 'Ie wo isshukan rusu ni suru' means 'To be away from the house for one week.' It is important to note that the 'ni' in 'rusu ni suru' functions as a resultative particle, indicating the state that is being created through the action of leaving.

When conjugating this verb, it follows the standard pattern for suru verbs. In polite speech, it becomes rusu ni shimasu. In the past tense, it is rusu ni shimashita. If you are describing a continuous state of being away, you might use the te-iru form: rusu ni shite iru. For example, 'Kare wa ima ie wo rusu ni shite iru' (He is currently away from home). This distinction is subtle but important for B1 learners; rusu ni suru often implies the act of leaving or the decision to be away, while rusu ni shite iru emphasizes the current state of absence.

Common Pattern 1

[Duration] + 留守にする (To be away for [Duration])

Common Pattern 2

家を留守にする (To leave the house empty/be away from home)

Another critical aspect is the use of honorifics. If you are talking about someone else's absence, particularly someone of higher status, you might use o-rusu ni nasaru or go-rusu ni sareru, although o-rusu desu is more common for simply stating they are out. Conversely, if you are apologizing for being away when someone called or visited, you might say, 'O-isogashii tokoro, rusu ni shite ite moushiwake arimasen' (I am sorry for being away when you were busy enough to visit/call). This shows how the verb integrates into the complex web of Japanese politeness and social etiquette.

In more advanced contexts, you might see rusu ni suru used metaphorically. For example, if someone is so focused on one thing that they neglect another, one might say they are 'leaving their duties rusu' (keeping them in a state of absence). However, for B1 learners, focusing on the literal meaning of physical absence from a residence is the priority. Practice combining it with various time expressions like shibaraku (for a while), nagai aida (for a long time), or tamani (occasionally) to increase your expressive range.

The phrase 留守にする (rusu ni suru) is ubiquitous in Japanese daily life, and you will encounter it in several specific environments. One of the most frequent places you will hear it is in the context of logistics and home services. Japan's delivery culture is highly efficient, and the interaction between a customer and a courier often revolves around whether someone is home. When you call a delivery company to schedule a redelivery, you might explain, 'Kyo wa gogo kara ie wo rusu ni shimasu' (I will be away from home from this afternoon). This helps the driver plan their route and avoid unnecessary trips.

Another common setting is within the neighborhood. In Japanese apartment complexes (manshon) or traditional neighborhoods, there is a strong culture of 'mimamori' (watching over). If you are going on a long trip, it is polite to tell a trusted neighbor, 'Shibaraku ie wo rusu ni shimasu node, yoroshiku onegaishimasu' (I will be away for a while, so please look out for the place). This is not just a polite gesture; it is a practical security measure. Conversely, you might hear a neighbor say, 'O-taku, saikin yoku rusu ni shite imasu ne' (You've been away from home a lot lately, haven't you?), which is often a way of showing concern or just making small talk.

Scenario: Travel Agency

When booking a trip, an agent might ask if you have someone to check your mail while you are 'rusu ni suru'.

Scenario: Office Setting

A colleague might mention that the boss will 'rusu ni suru' the office for a business trip.

In media, specifically in dramas or anime, rusu ni suru is a standard plot device. You might hear a parent telling a child, 'Ie wo rusu ni suru aida, chanto rusu-ban shite ne' (While I'm away, make sure to house-sit properly). This highlights the relationship between rusu ni suru (the person leaving) and rusu-ban suru (the person staying behind to watch the house). In news reports, you might hear it in the context of crime prevention, where police advise citizens not to make it obvious that they are 'rusu ni shite iru' (currently away) by letting mail pile up.

Finally, you will encounter this phrase in written form on signs or notices. For example, a small family-run shop might put up a sign saying 'Tadaima rusu ni shite orimasu' (We are currently away/out), using the humble orimasu form. This is a very common sight in rural Japan or in older shopping districts (shotengai). By recognizing this phrase, you gain a deeper understanding of the rhythms of Japanese life and the ebb and flow of people moving in and out of their private and professional spaces.

One of the most frequent errors English speakers make with 留守にする (rusu ni suru) is confusing it with the term for 'house-sitting,' which is 留守番 (rusuban). While they share the same kanji for 'rusu,' their meanings are opposite in terms of physical presence. Rusu ni suru means YOU are leaving, whereas rusuban suru means YOU are staying behind to watch the house while others are away. A common mistake is saying 'Ie wo rusu ni shimasu' when you actually mean 'I will stay and watch the house.' To avoid this, remember that ban (番) means 'a turn' or 'watching over,' so rusuban is the 'absence-watch.'

Mistake

Using 'rusu ni suru' to mean 'watching the house'.

Correction

Use 'rusuban wo suru' for watching the house.

Another common pitfall is the confusion between rusu and fuzai (不在). While both mean 'absence,' they are used in different registers and settings. Rusu is predominantly used for one's home or a general sense of being out. Fuzai is more formal and is the standard term used in business or official documents. For instance, a 'delivery attempt notice' is called a fuzai-hyo, not a rusu-hyo. If you are at the office and a colleague is away from their desk, saying 'Tanaka-san wa rusu desu' might sound slightly odd or too personal; 'Tanaka-san wa fuzai desu' or 'Tanaka-san wa seki wo hazushite orimasu' (is away from their seat) is much more professional.

Learners also struggle with the particle usage. Some mistakenly use ie ni rusu ni suru instead of ie wo rusu ni suru. Remember that rusu ni suru is an action being performed on the house (leaving it empty), so the object marker wo is required. Furthermore, don't confuse rusu ni suru with dekakeru (to go out). Dekakeru focuses on the act of leaving and the destination, while rusu ni suru focuses on the duration and state of the house being empty. If you are just popping out for 10 minutes to the convenience store, dekakeru is more appropriate. If you are going to be gone long enough that the house is 'unattended,' rusu ni suru becomes relevant.

Finally, be careful with the phrase rusu wo tsukau. As mentioned before, this means 'to pretend to be out.' If you accidentally say 'Ie wo rusu ni tsukaimashita' when you meant 'I was away from home,' people might think you were hiding from someone! Precision with these auxiliary verbs and particles is what separates a B1 learner from a truly fluent speaker. Always consider the 'state' of the place you are leaving behind when you choose to use rusu ni suru.

To enrich your Japanese vocabulary, it is helpful to look at words that are similar to 留守にする (rusu ni suru) but carry different nuances. The most direct alternative is 外出する (gaishutsu suru). While rusu ni suru focuses on the empty home, gaishutsu suru focuses on the person going out. It is a slightly more formal way to say 'to go out' and is often used in business or when making formal plans. For example, 'Gogo wa gaishutsu shimasu' (I will be out in the afternoon) is a standard way to tell your boss you have an external meeting.

Comparison: 留守 vs 外出

留守: Focus on the place left behind (Home is empty).
外出: Focus on the person's movement (Person is out).

Another related term is 出かける (dekakeru). This is the most common, casual way to say 'to go out.' It is used for short trips, like going to the park, a restaurant, or a friend's house. Unlike rusu ni suru, which can imply a long-term absence (like a vacation), dekakeru is usually for daily activities. If you say 'Chotto dekakete kuru' (I'm just going out for a bit), it implies you'll be back soon. In contrast, 'Ie wo rusu ni suru' would sound too heavy for a quick trip to the mailbox.

In a professional context, you will often hear 席を外す (seki wo hazusu). This literally means 'to remove oneself from one's seat.' It is the polite way to say someone is temporarily away from their desk—perhaps in a meeting, on a break, or in the restroom. Using rusu in this context would be inappropriate because an office is not a 'home' that you leave empty. Similarly, 不在 (fuzai) is used on official forms and in formal speech to denote 'absence.' If you are writing a formal email explaining you will be out of the office, you might use 'fuzai ni shimasu' or 'gaishutsu shite orimasu.'

Finally, for long-term absences like moving away or being gone for years, you might use hanareru (to be separated from). But for the CEFR B1 level, mastering the trio of rusu ni suru, dekakeru, and gaishutsu suru will cover 90% of your needs. Each word acts as a tool in your linguistic toolbox, allowing you to describe your movements and the status of your home with precision and cultural awareness. Practice switching between these based on whether you are talking to a friend, a neighbor, or a colleague.

Summary Table

- 留守にする: Home-focused, absence duration.
- 出かける: Personal movement, casual.
- 外出する: Personal movement, formal.
- 席を外す: Office-focused, temporary.
- 不在: Formal/Technical, general absence.