Definition of button one's lip in English:
informal Stop or refrain from talking.
- But they do like and respect him, and I can't imagine them agreeing that as a former Governor General he should button his lip.
- The nation's professional churl had finally been forced to button his lip.
- I'd told her this was payback for keeping me in the dark about the visit of Lorne, Bryan, and Co. on my birthday, and buttoned my lip.
Definition of button one's lip in:
- US English dictionary