pipe down
US /paɪp daʊn/
UK /paɪp daʊn/

1.
calar a boca, ficar quieto
used to tell someone to stop talking or to be quiet
:
•
Will you two just pipe down? I'm trying to concentrate.
Vocês dois, podem calar a boca? Estou tentando me concentrar.
•
The teacher told the noisy students to pipe down.
O professor disse aos alunos barulhentos para calar a boca.