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口を出す

to interfere; to meddle or offer unsolicited opinions

→ 口
phrase Uncommon #19,422
to interfere; to meddle or offer unsolicited opinions Often means meddling in someone else's affairs or giving an opinion when it was not wanted.
JA: 彼の計画に口を出すな。
EN: Don't interfere with his plans.

昇進について私が口を出すことは、めったにない。

I rarely have any say in promotions.

お前が口を出すことではない。

It's none of your business.