button your lip
US /ˈbʌt.ən jʊər lɪp/
UK /ˈbʌt.ən jʊər lɪp/
1.
calar a boca, ficar quieto
to stop talking or to keep quiet
:
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The teacher told the noisy students to button their lip.
O professor disse aos alunos barulhentos para calar a boca.
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I had to button my lip to avoid arguing with him.
Eu tive que calar a boca para evitar discutir com ele.