들이다

The Korean verb 들이다 (deul-i-da) is a multi-faceted word that primarily functions as the causative form of the verb 들다 (deul-da), which means 'to enter.' At its most basic level, 들이다 translates to 'to let in' or 'to make something enter.' However, its usage extends far beyond simple physical movement across a threshold. Understanding this word requires a grasp of how Korean speakers conceptualize the movement of resources, habits, and even colors from an external state to an internal one. When you use 들이다, you are describing an active process where a subject brings an object into a specific space, state, or condition. This could be as literal as allowing a guest into your home or as metaphorical as investing a significant amount of effort into a creative project. The word carries a nuance of intentionality; it is not a passive occurrence but a deliberate action taken by the subject.

Physical Entry

This is the most direct application. It involves moving an object or person from the outside to the inside of a structure. For example, when you move furniture into a new house, you are '들이다'-ing that furniture. If you allow a stray cat into your room, you are '들이다'-ing the cat. It emphasizes the crossing of a boundary.

Investment of Resources

One of the most common uses for intermediate learners is expressing the 'spending' or 'investing' of time, money, or effort. Unlike the verb '쓰다' (to use), 들이다 often implies that the resource is being poured into something to achieve a result. When you '공을 들이다' (put in effort) or '시간을 들이다' (spend time), there is a sense of dedication and purpose behind the expenditure.

Furthermore, 들이다 is the standard verb used when talking about the acquisition of habits or tastes. In Korean, you don't just 'start' a habit; you 'bring it in' to your lifestyle. This is seen in the phrase '버릇을 들이다' (to form a habit) or '맛을 들이다' (to develop a taste for something). It suggests that the habit was once external to you, but through repetition, you have integrated it into your character. This conceptualization of internalizing the external is a key feature of the Korean language. Additionally, the word is used in the context of dyeing fabrics or coloring things. When you '색을 들이다', you are causing the color to enter the fibers of the cloth. This literal 'letting in' of pigment perfectly aligns with the causative nature of the verb.

In social contexts, 들이다 can also carry a sense of welcoming or acceptance. To '사위나 며느리를 들이다' means to welcome a son-in-law or daughter-in-law into the family. This isn't just about physical presence; it's about the formal inclusion of a new person into the family circle. This highlights the word's importance in describing life transitions and relationship dynamics. Because it covers so many domains—from home maintenance to personal growth and family life—it is an essential verb for anyone reaching the B1 level of proficiency. It allows for more nuanced descriptions than simple verbs like '하다' (to do) or '오다' (to come).

Dyeing and Coloring

Used when applying color to something so that it soaks in. '봉숭아 물을 들이다' (to dye fingernails with balsam flowers) is a classic cultural reference in Korea.

Using 들이다 correctly in a sentence requires attention to the particles and the specific objects being 'brought in.' As a transitive verb, it almost always takes the object particle -을/를. The structure typically follows [Subject] + [Object]-을/를 + [Location/Target]-에 + 들이다. For instance, if you are bringing a person into a room, the person is the object, and the room is the location. If you are spending money on a car, the money is the object, and the car is the target. This consistency makes the verb relatively easy to plug into various grammatical patterns once you understand the core logic.

With Physical Objects

When moving physical items, use '안으로' (inside) or specific room names. Example: '짐을 방 안으로 들여 놓으세요' (Please bring the luggage into the room and set it down). Here, '들여 놓다' is a common compound verb meaning to bring in and place.

With Abstract Concepts

When talking about effort or time, the target of the effort is marked with '-에'. Example: '이 일에 많은 시간을 들였어요' (I spent a lot of time on this work). This emphasizes that the time was 'put into' the work rather than just spent generally.

In terms of conjugation, 들이다 is a regular verb. In the polite present tense, it becomes 들여요 (deul-yeo-yo). In the past tense, it is 들였어요 (deul-yeot-eo-yo). Because it ends in '-이-', the combination with the '-어' suffix results in '-여'. This is a common pattern for verbs ending in '-이다' (like 기다리다 becoming 기다려요). Learners should be careful not to confuse it with the honorific '드리다' (deu-ri-da), which means 'to give' to a superior. While they sound similar, their meanings and usages are entirely different. 들이다 is about 'bringing in,' while '드리다' is about 'upward giving.'

Another sophisticated way to use 들이다 is in the passive-like causative constructions where something is 'made' to have a certain quality. For example, '맛을 들이다' can mean letting food ferment until it reaches its peak flavor. If you are making kimchi, you wait for it to '맛이 들다' (flavor to enter/mature), but as the cook, you '맛을 들이다' (cause the flavor to mature) by providing the right conditions. This distinction between the auto-focus '들다' and the agent-focus '들이다' is crucial for mastering Korean verb dynamics. In academic or formal writing, you will often see 들이다 used to describe the investment of national resources or public effort into infrastructure or social programs.

Habit Formation

Use '습관을 들이다' for positive habits. Example: '운동하는 습관을 들였어요' (I formed a habit of exercising). For negative habits, '버릇을 들이다' is more common.

In daily life in Korea, you will encounter 들이다 in a variety of settings, ranging from the domestic to the professional. One of the most common places is at home. If you are visiting a Korean friend, they might say '안으로 드세요' (Please come in - using the honorific version of '들다'), but if they are talking about letting the dog in, they would use '강아지를 들여보내다' (Let the dog in). You will also hear it frequently in the context of interior design and shopping. Salespeople might ask if you are looking to '새 가구를 들이다' (bring in new furniture) for your home. This usage is very common in commercials for home appliances and furniture brands.

Workplace and Projects

In a professional setting, managers often use the phrase '공을 들이다' when discussing a high-priority project. If a report is particularly well-done, a colleague might comment, '정말 공을 많이 들이셨네요' (You really put a lot of effort into this). This is a high compliment because it acknowledges the 'sincerity' and 'merit' invested in the work.

Traditional Culture

You will hear this word in documentaries or during traditional workshops. For instance, '천연 염색으로 색을 들이다' (to color with natural dyes) is a phrase used when discussing traditional Korean aesthetics. It emphasizes the slow, natural process of the dye entering the fabric.

If you watch Korean dramas (K-dramas), you'll often hear 들이다 in the context of family relationships. A mother-in-law might talk about '새 식구를 들이다' (bringing in a new family member) when her son gets married. This phrase carries a heavy emotional and social weight, as it signifies the expansion of the family unit. Additionally, in cooking shows, chefs frequently mention '간이 들이다' or '맛을 들이다' when explaining how to let seasoning soak into ingredients. They might say, '고기에 양념이 잘 들게 시간을 좀 들이세요' (Spend some time so the seasoning can soak into the meat well), using both the 'soak in' and 'spend time' meanings in one breath.

In the news, 들이다 is used when discussing economic investments or the introduction of new technology. A headline might read '신기술을 공정에 들이다' (Introducing new technology into the process). Here, it sounds more formal and professional than '사용하다' (to use). It implies a systematic integration of the technology into the existing framework. Whether you are at a construction site hearing about the '인력을 들이다' (bringing in manpower) or at a hair salon hearing about '머리에 색을 들이다' (coloring hair), the word is ubiquitous. Its ability to bridge the gap between physical labor, emotional investment, and technical processes makes it a powerhouse in the Korean lexicon.

News and Media

Often used in economic reports: '외국 자본을 들이다' (to bring in foreign capital). This highlights the causative 'bringing in' of financial resources into the domestic market.

One of the most frequent mistakes English speakers make with 들이다 is confusing it with its base verb 들다. While they are related, the grammatical roles are distinct. 들다 is often intransitive (e.g., '햇빛이 들다' - sunlight enters), whereas 들이다 is causative and transitive (e.g., '햇빛을 들이다' - to let the sunlight in). If you say '돈을 들었어요' instead of '돈을 들였어요,' it sounds like you are saying you 'held' the money (from another meaning of 들다) or that the money entered somewhere on its own. To express that YOU spent the money or effort, you must use the causative 들이다.

Confusing with '드리다' (To Give)

This is a classic phonetic trap. '드리다' (deu-ri-da) is the honorific form of '주다' (to give). Because they sound almost identical to the untrained ear, students often write '선물을 들였어요' when they mean '선물을 드렸어요' (I gave a gift to a superior). Remember: '들이다' is about 'in,' while '드리다' is about 'giving.'

Misusing with '쓰다' (To Use)

While both can mean 'to spend,' 들이다 implies investment or devotion. You can '돈을 쓰다' (spend money) on a coffee, but you '돈을 들이다' (invest money) in a house renovation. Using 들이다 for trivial daily spending can sound a bit overly dramatic or unnatural.

Another error involves the particles. When using 들이다 for habits, some learners use the subject particle '-이/가' for the habit itself. For example, saying '좋은 습관이 들였어요' is incorrect. Since 들이다 is transitive, it needs '좋은 습관을 들였어요.' If you want to use the subject particle, you must use the non-causative version: '좋은 습관이 들었어요' (A good habit has been formed/entered). Understanding the 'who-did-what' in the causative relationship is vital. If you are the agent of change, use 들이다 with the object particle. If the change is just happening, use 들다 with the subject particle.

Finally, learners sometimes confuse 들이다 with 입히다 (to clothe/coat). When talking about colors, if you are dyeing the whole material so the color goes *into* the fibers, use 들이다. If you are just painting or coating the surface, 칠하다 (to paint) or 입히다 might be more appropriate. For example, '손톱에 봉숭아 물을 들이다' is correct because the dye penetrates the nail. If you are just using nail polish, you would say '매니큐어를 바르다' (to apply/smear). Paying attention to whether the 'object' is actually entering the 'target' will help you choose the right verb every time.

Over-complication

Sometimes learners try to use '들게 하다' (make it enter) instead of the natural causative 들이다. While '들게 하다' is grammatically possible, 들이다 is the standard lexical causative and sounds much more natural.

To truly master 들이다, it is helpful to compare it with several synonyms and related terms. Since 들이다 covers such a wide range of meanings—from physical movement to financial investment—it has different alternatives depending on the context. By understanding these nuances, you can choose the most precise word for your intended meaning and sound more like a native speaker. The most common synonyms are often more specific, whereas 들이다 is a broad, versatile verb that works in many situations.

투자하다 (To Invest)

When 들이다 is used for money or time, 투자하다 is a common alternative. However, 투자하다 is more formal and specifically implies an expectation of a future return (ROI). You '투자하다' in stocks or a business. You '들이다' effort into a hobby or money into a home renovation.

소비하다 (To Consume/Spend)

This word focuses on the 'depletion' of a resource. If you are talking about 'using up' time or energy, 소비하다 is used. 들이다, by contrast, focuses on the 'inputting' of that resource into a task. 소비하다 is more neutral/scientific, while 들이다 feels more active and intentional.

In the context of 'letting someone in,' alternatives include 초대하다 (to invite) and 입장시키다 (to allow entry/admit). 초대하다 is used for the social act of asking someone to come, while 들이다 is the physical act of opening the door and letting them cross the threshold. 입장시키다 is very formal and often used in the context of events, theaters, or stadiums. For example, a security guard '입장시키다'-s the audience, but a host '들이다'-s a guest into their home. Choosing between these depends entirely on the formality of the situation and the physical nature of the entry.

When it comes to habits, 형성하다 (to form) is a formal alternative to '습관을 들이다.' You might see '습관 형성' in a psychology book or a self-help article. In daily conversation, however, '습관을 들이다' is much more natural. Similarly, for dyeing, 염색하다 (to dye) is the specific verb for hair or fabric. While '색을 들이다' is a beautiful, somewhat poetic way to describe the process, 염색하다 is the practical term you would use at a hair salon. Understanding these layers of formality and specificity will help you navigate Korean social situations with greater ease and precision.

들이키다 (To Gulp/Inhale)

Often confused due to the sound. 들이키다 means to drink or breathe in deeply. While it shares the 'inward' direction, it is a separate verb used specifically for liquids and air. Example: '물을 단숨에 들이켰다' (Gulped down water in one breath).