bite your tongue

US /baɪt jʊər tʌŋ/
UK /baɪt jʊər tʌŋ/
"bite your tongue" picture
1.

口をつぐむ, 言いたいことを我慢する

to make a conscious effort to avoid saying something that you want to say, often because it would be inappropriate or cause trouble

:
I had to bite my tongue to keep from telling him what I really thought.
本当に思っていることを言わないように、口をつぐまなければならなかった
She wanted to argue, but decided to bite her tongue.
彼女は議論したかったが、口をつぐむことにした。