Japanese Compound Verbs: How ~込む, ~出す, ~切る, ~直す Add Nuance

🗣️ Why compound verbs are a fluency unlock

Hi everyone! Kenji here 😊

If your Japanese feels textbook-correct but flat, the missing layer might be compound verbs (複合動詞ふくごうどうし) — two verbs joined to create a new, richer meaning. Natives use them constantly. Learners often stop at the base verb.

Let me unpack four key suffixes that pack the most punch.

1. 📥 ~込む (komu): 'deeply / inward'

Most learners know 込む as to enter / go in. But its compound-verb function is emphasis or deep psychological/physical immersion.

📖 ~込む in action

Compound	Meaning	Nuance
飛とび込こむ	dive / jump in	physical motion
考かんがえ込こむ	brood, deep-think	mental immersion
落おち込こむ	get depressed	emotional sinking
申もうし込こむ	apply / sign up	formally submit

📝 Example

彼かれは何なにか考かんえ込こんでいるようです。 — He seems lost in deep thought.

Use 込む when just thinking / falling / applying isn't strong enough.

2. 💥 ~出す (dasu): 'suddenly / burst out'

~出す has two uses: take outside AND spontaneously start. The second is what trips learners up.

⚠️ Don't translate every began to as ~始める. Use ~出す for sudden, often involuntary beginnings.

🗣️ Different feel

泣なき始はじめた — decided to start crying (volition implied; weird)
泣なき出だした — burst into tears (sudden, spontaneous)

For weather, emotional outbursts, sudden phenomena → ~出す.

📝 Examples

急きゅうに雨あめが降ふり出だした。 — Suddenly started raining.
赤あかちゃんが笑わらい出だした。 — The baby burst into laughter.

3. ✂️ ~切る (kiru): 'completely / to the end'

~切る doesn't mean cut in compound verbs. It means completing fully / using up entirely.

📖 ~切る compounds

Compound	Meaning
使つかい切きる	use up completely
食たべ切きる	eat all of it
読よみ切きる	finish reading
言いい切きる	say with full conviction
諦あきらめ切きれない	can't fully give up

📝 Example

シャンプーを使つかい切きったので買かわなきゃ。 — I used up the shampoo so I need to buy more.

Used vs used up — Japanese makes the fully part its own grammatical option.

4. 🔁 ~直す (naosu): 'do it again / fix and redo'

~直す = redo, with the implication of fixing or improving.

📖 ~直す compounds

Compound	Meaning
書かき直なおす	rewrite
やり直なおす	redo from start
考かんがえ直なおす	reconsider
見直みなおす	take another look (often re-evaluate positively)

📝 Examples

このレポート、書かき直なおします。 — I'll rewrite this report.
彼かれの能力のうりょくを見直みなおした。 — I re-evaluated his ability (and now think more highly).

見直す in particular has a subtle positive nuance — re-look and gain new appreciation.

📊 Quick cheat sheet

Suffix English vibe Examples
~込む deeply, intensely 考込えむ, 落込ちむ
~出す suddenly burst 泣出きす, 降出りす
~切る fully, completely 使切いる, 食切べる
~直す redo, fix 書直きす, 考直えす

Suffix	English vibe	Examples
~込む	deeply, intensely	考込えむ, 落込ちむ
~出す	suddenly burst	泣出きす, 降出りす
~切る	fully, completely	使切いる, 食切べる
~直す	redo, fix	書直きす, 考直えす

✨ Kenji's recap

~込む = deepens or makes immersive.
~出す = sudden / spontaneous start (not volitional).
~切る = completion / using fully.
~直す = redo / re-evaluate / improve.
Reach for compound verbs when the base verb feels too plain.

Master these four and your Japanese verb usage suddenly has color. 🎨