Jisho

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Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
1. to be the first to speak; to break the silenceIdiomatic expression
Expressions (phrases, clauses, etc.), Godan verb with 'ru' ending
2. to open something for the first time; to broach (e.g. a cask); to break a seal; to break open
Other forms
口をきる 【くちをきる】

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