保守秘密;守口如瓶;遮掩;隱瞞
keep a / the lid on sth
to keep sth secret or hidden
把…控制住;抑制住
to keep sth under control
The government is keeping the lid on inflation.政府正在控制通貨膨脹。
釋義來自《牛津高階英漢雙解詞典》第 9 版