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口を挟む

to interrupt

→ 口
phrase Uncommon #12,623
to interrupt Often suggests interjecting when it may be unwelcome or not your place to speak.
JA: 彼は会話の最中に口を挟むことがよくある。
EN: He often interrupts in the middle of a conversation.

彼は会話の最中に口を挟むことがよくある。

He often interrupts during conversations.

法律の専門家たちの確認と、彼らのあれこれ口を挟むのが条件だった。

The condition was that legal experts review it and weigh in on all sorts of things.

私が口を挟むことではないのは分かってます。

I know it’s not my place to get involved.

ガキが口を挟むなよ!

Keep your mouth shut, brat!

— One Cut of the Dead (2017)