Definition of button one's lip in English:

button one's lip

informal Stop or refrain from talking.
More example sentences
  • 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.
See parent entry: button

Definition of button one's lip in:

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true