gagging the clam - when everything goes to hell but you still have to keep your

when everything goes to hell but you still have to keep your mouth shut and pretend you're not dying inside

My mom said I was gagging the clam at the dinner table. I just ate my salad in silence.

I got gagging the clam at work because I had to listen to my boss yell at someone else.

My friend said I was gagging the clam during the movie. I just wanted to scream.