Jisho

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Words — 1 found

Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
1. tight-lipped; able to keep a secretSee also 口の堅い, Antonym: 口が軽い
Other forms
口が固い 【くちがかたい】口がかたい 【くちがかたい】
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