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# Japanese idiom - 口を利く(To make one's mouth effective)
- URL: https://keithhayden.net/japanese-idiom-kou-woli-ku-to-make-ones-mouth-effective/
- Published: 2026-05-19T00:40:52.000Z
- Updated: 2026-05-19T01:05:30.000Z
- Author: Keith Hayden
- Tags: japanese

口

JAPANESE · 日本語 COLLOQUIAL IDIOM 

# 口を利く kuchi o kiku

LITERAL TRANSLATION"To make one's mouth effective." 

COMPONENT BREAKDOWN

| 口  | kuchi | Mouth. By extension: words, speech, the act of saying.                                                                                          |
| -- | ----- | ----------------------------------------------------------------------------------------------------------------------------------------------- |
| 利く | kiku  | To be effective; to function; to exert influence. The same verb in *薬が利く* (the medicine works) and *気が利く* (to be perceptive, to read the room). |

HISTORICAL ORIGIN

Originally, the phrase did not mean simply *to talk.* It meant **to make one's words effective** — and that effectiveness had a specific social shape.

In its older sense, *口を利く* belonged to mediators, negotiators, and brokers. Someone who "used their mouth effectively" was leveraging social standing or eloquence to intervene in a dispute, arrange a marriage, or close a business deal. To have a person *kuchi o kiku* for you was to have them put in a good word on your behalf — to spend their influence in your direction.

The mouth wasn't merely opened. It was *wielded.*

SEMANTIC SHIFT

Over time, the phrase split. In modern Japanese, two primary usages now live side by side — one preserves the old sense of leveraged speech; the other strips the verb down to the bare act of conversing.

① ORIGINAL MEANING 

Mediation & Influence

The older sense survives, used to describe acting as an intermediary or putting in a good word on someone's behalf.

EXAMPLE就職の口を利いてもらう "To have someone put in a good word for a job." 

② BROADENED MEANING 

General Speech

The meaning thinned to refer to the basic act of conversing — and surfaces most frequently in the negative form, to describe a breakdown in communication or a deliberate, sustained silence.

EXAMPLE彼とは口を利かない "I don't speak with him." / "I'm giving him the silent treatment." 

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