hold one’s tongue

(verb) to try really hard to not say something

Example Sentences:

When my son told me he wanted to quit university to become an artist, I had to hold my tongue and accept his decision.

Roberto held his tongue when Sarah told him she wanted to study English in Mexico.

Best Friend #1: I have an announcement to make.
Best Friend #2: What?
Best Friend #1: I’m getting back together with my ex-boyfriend, Bobby.
Best Friend #2: Really? Is this the same ex-boyfriend who dated your sister?
Best Friend #1: Yes, but he loves me again, so we’re going to try to have another relationship.
Best Friend #2: ….
Best Friend #1: What?
Best Friend #2: I’m holding my tongue.
Best Friend #1: Why?
Best Friend #2: Because I think you’re an idiot.

From the Blogs:

Oratorical Piece: Hold Your Tongue

Media:

Similar idioms:

1. bite one’s tongue
2. cat got your tongue
3. hold it against someone
4. does not hold water
5. hold on
6. on the tip of one’s tongue
7. make light of
8. hold one’s sides
9. fickle
10. give someone a piece of your mind