Idiom: To Bite Your Tongue

to stay silent, to stop yourself from saying something, to prevent yourself from commenting on something.

Example:

I had to bite my tongue about the mess he made in the kitchen when he cooked our supper.

مفهوم به فارسی : حرفی به زبان نیاور
معادل در فارسی : زبانت را گاز بگیر