keep a lid on
US /kiːp ə lɪd ɑn/
UK /kiːp ə lɪd ɑn/

1.
manter em segredo, controlar, conter
to control or keep something secret, especially something that could cause trouble or embarrassment
:
•
The company tried to keep a lid on the scandal.
A empresa tentou manter em segredo o escândalo.
•
We need to keep a lid on our spending this month.
Precisamos controlar nossos gastos este mês.