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

1.
억제하다, 비밀로 하다, 덮다
to control or keep something secret, especially something that could cause trouble or embarrassment
:
•
The company tried to keep a lid on the scandal.
회사는 스캔들을 덮으려고 노력했다.
•
We need to keep a lid on our spending this month.
이번 달에는 지출을 억제해야 한다.