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

1.
控制, 保密, 掩盖
to control or keep something secret, especially something that could cause trouble or embarrassment
:
•
The company tried to keep a lid on the scandal.
公司试图掩盖丑闻。
•
We need to keep a lid on our spending this month.
我们这个月需要控制开支。