bite your tongue

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

morderse la lengua, callarse

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.
Tuve que morderme la lengua para no decirle lo que realmente pensaba.
She wanted to argue, but decided to bite her tongue.
Quería discutir, pero decidió morderme la lengua.