belt up
US /belt ʌp/
UK /belt ʌp/

1.
colocar o cinto, apertar o cinto
to fasten your seatbelt in a car or aircraft
:
•
Make sure everyone belts up before we start driving.
Certifique-se de que todos coloquem o cinto antes de começarmos a dirigir.
•
The flight attendant reminded passengers to belt up for landing.
A aeromoça lembrou os passageiros de colocarem o cinto para o pouso.
2.
calar a boca, ficar quieto
(informal, British) to stop talking or be quiet
:
•
Oh, belt up, will you? I'm trying to concentrate.
Ah, cala a boca, por favor? Estou tentando me concentrar.
•
He told the noisy kids to belt up.
Ele disse para as crianças barulhentas calarem a boca.