hold your tongue
US /hoʊld jʊər tʌŋ/
UK /hoʊld jʊər tʌŋ/

1.
입을 다물다, 침묵하다
to remain silent and not speak, especially when you want to say something negative or critical
:
•
I had to hold my tongue when my boss made that ridiculous suggestion.
상사가 그 터무니없는 제안을 했을 때 나는 입을 다물어야 했다.
•
It's best to hold your tongue if you don't have anything nice to say.
좋은 말을 할 것이 없다면 입을 다무는 것이 최선이다.