Introduction
Have you ever come across verbs like 飲み込む, 考え込む, or 駆け込む and wondered what the 込む part adds?
All of these use the compound verb (複合動詞) ending ～込む (komu), one of the most productive endings in Japanese.
1. Meaning: What does ～込む mean?
The verb 込む by itself carries the image of something going inward or packing in densely.
Attached to another verb, ～込む (komu) often adds one of two broad ideas:
- Movement or placement inward — something enters a space, or something is put into it.
- Depth or intensity — an action goes deep, continues intensively, or involves becoming deeply absorbed in something.
These are useful patterns, but they do not explain every ～込む verb.
Some compounds have developed more specific meanings, so it is important to learn common combinations as vocabulary, too.
① Movement into something
This use adds the sense that the action moves into an enclosed space—a room, a machine, a body, a container.
Common English equivalents:
- ~ into
- ~ in
- insert / rush in / swallow down
Example:
この薬は噛まずに飲み込んでくださいね。
Please swallow this medicine whole, without chewing it.
② Doing something thoroughly, over time
Here the “inward” image becomes figurative: the action goes deep.
It continues for a long time, or is done intensively until the effect sinks in.
Common English equivalents:
- ~ for a long time
- ~ thoroughly / deeply
- be absorbed in ~ing
Example:
友だちとの会話が楽しくて、夜まで話し込んでしまった。
The conversation with my friend was so enjoyable that we ended up talking right into the night.
Both meanings come from the same picture.
In ①, something physically enters a space.
In ②, the action itself sinks in deeply.
2. Formation
Verb (masu-form) stem + 込む
Take the ます form and drop ます:
- 走る → 走ります → 走り込む
- 飲む → 飲みます → 飲み込む
- 考える → 考えます → 考え込む
- 差す → 差します → 差し込む
The result is a Group 1 (う-verb) ending in む, so it conjugates like 読む:
- 飲み込む → 飲み込みます／飲み込んだ／飲み込んで／飲み込まない
Which verbs go with which meaning
The verb before 込む often gives you a clue to its meaning, but context also matters.
Some compounds have more than one meaning, so it is useful to learn them in context.
- Movement verbs → meaning ①
- 駆け込む (rush in)
- 入り込む (get inside)
- 乗り込む (board)
- 上がり込む (come right into a house)
- Verbs of putting → also meaning ①
- 差し込む (insert)
- 書き込む (write in)
- 詰め込む (cram in)
- 振り込む (transfer money into an account)
- Verbs of continued effort → meaning ②
- 煮込む (simmer)
- 考え込む (ponder)
- 話し込む (talk at length)
- 走り込む (train by running)
- 打ち込む (devote oneself)
Practical tip
With meaning ①, the destination usually appears with に.
- 部屋に駆け込む (rush into the room)
- カードをカードリーダーに差し込む (insert the card into the card reader)
3. Useful Examples
① Movement into something
Situation: John is at the supermarket checkout.
クレジットカードは使えますか。
Do you accept credit cards?
はい。ここにカードを差し込んでください。
Yes. Please insert your card here.
デパートの開店と同時に、セール品めがけて、たくさんの人が駆け込んだ。
The moment the department store opened, crowds rushed in, heading for the sale items.
この文法はテストに出やすいから、しっかり頭に叩き込んでおこう。
This grammar is likely to appear on the test, so make sure you really commit it to memory.
② Doing something thoroughly
勉強中の娘が、ずっと考え込んでいる。難しい問題を解いているのかな。
My daughter has been deep in thought this whole time while studying. I wonder if she’s working on a hard problem.
あの店は、数日かけてスープをじっくり煮込んでいるらしい。
Apparently that restaurant simmers its soup slowly over several days.
来週のマラソン大会に向けて、今日は一時間走り込んだ。
With next week’s marathon coming up, I put in a solid hour of running today.
姉は東京大学に合格するために勉強に打ち込んでいる。
My sister is throwing herself into her studies to get into the University of Tokyo.
4. Related grammar
～続ける
Both can describe actions that continue over time, but ～続ける mainly emphasizes continuation.
Depending on the verb, ～込む can add a sense of depth, intensity, concentration, or movement inward.
Some ～込む compounds also have established meanings of their own.
Compare:
- 2時間話し続けた。= I kept talking for two hours. (a neutral fact)
- つい話し込んでしまった。= We got so caught up in talking that we lost track of time. (a nuance of being caught up in it)
入れる
入れる also means “put into,” but it is a plain statement of placement.
～込む suggests going deeper inside, often with force or in a confined space.
- かばんに本を入れた。= I put the book in my bag.
- かばんに服を詰め込んだ。= I crammed clothes into my bag.
Set words built on ～込む
Some ～込む compounds have become independent vocabulary whose meaning you cannot fully predict from the parts.
These are worth learning one by one.
- 落ち込む = to feel down, to be depressed
- 試験に落ちて、落ち込んでいる。= I’m down after failing the exam.
- 思い込む = to be convinced of something (often mistakenly)
- 会議は明日だと思い込んでいた。= I was sure the meeting was tomorrow.
- 申し込む = to apply, to sign up
- オンラインで申し込みました。= I applied online.
5. Common Mistake: ～込こむ is not a free ending
～込む works only with certain verbs
Unlike ～始める or ～続ける, ～込む does not combine naturally with every verb.
Many combinations are established expressions, and their meanings are not always predictable from the individual parts.
A good learning strategy is to start with common, established combinations and learn how they are used in context.
Remember this golden rule:
- Safe: Use common, established combinations listed in this article.
- Risky: Attaching ～込む to a verb just because the meaning seems to fit.
Example: I watched TV for a long time.
- ❌ Incorrect: 長い間テレビを見込んだ。
- ✅ Correct: 長い間テレビを見続けた。
particle に
A second trap is the particle.
With meaning ①, the place the action enters takes に, not で.
- ❌ Incorrect: 電車で乗り込んだ。
- ✅ Correct: 電車に乗り込んだ。(I got on the train.)
an independent verb “込む”
Finally, watch the kanji.
込む is also an independent verb meaning “to be crowded,” as in 電車が込んでいる (the train is packed).
Same character, different use—judge from whether another verb comes in front.
6. Practice
Translate the following into Japanese using ～込む.
| Clue | Example Answer |
|---|---|
| Please write your name and address on this form. | この用紙に名前と住所を書き込んでください。 |
| It started to rain, so I rushed into a café. | 雨が降り出したので、カフェに駆け込んだ。 |
| This curry tastes better because it was simmered overnight. | このカレーは一晩煮込んだから、おいしい。 |
| He has been devoting himself to his research for ten years. | 彼は10年間研究に打ち込んでいる。 |
7. FAQ
- QHow do I know which of the two meanings a ～込む verb has?
- A
Look at both the verb and the context.
If the compound describes entering or putting something into a space, it often follows meaning ①: 部屋に入り込む.
If it describes becoming deeply absorbed in an action or doing something intensively, it often follows meaning ②: 考え込む.
These are general patterns rather than strict rules. Some compounds have additional meanings that need to be learned individually.
- QIs ～込む formal or casual?
- A
Neither—it is standard, everyday Japanese used in both conversation and writing.
Several ～込む verbs are in fact the normal word for an everyday action, with no simpler alternative: 申し込む (apply)、振り込む (transfer money)、飲み込む (swallow).
- QDoes 飲み込む only mean ‘to swallow’?
- A
No, it has two more common uses, both built on the same “take it inside” image.
Holding words back: 文句を飲み込んだ = I swallowed my complaint.
Grasping something mentally: 彼は飲み込みが早い = He catches on quickly.
Conclusion
In this article, you learned that ～込む attaches to the ます-stem and carries two related meanings: moving into something, and doing something deeply or over a long time.
With this ending, you can now:
- describe things going into a space with 差し込む、駆け込む、書き込む,
- express absorption and sustained effort with 考え込む、話し込む、打ち込む,
- and recognize set words like 落ち込む and 申し込む that have meanings of their own.
