同义词： close up clam up dummy up shut up belt up button up be quiet
以上来源于: WordNet
remain silent , keep silence
You just keep mum about it.
你就保持沉默。
youdao
Tom, we got to keep mum.
汤姆，我们得守口如瓶。
I reckon we're safe as long as we keep mum.
我想只要我们保守秘密，就不会有危险。
Business owners who suspect a thief is within their ranks should keep mum until an investigation has been completed, says the ACFE's Mr. Ratley.
WSJ: Business Owners Get Burned by Sticky Fingers
It's been insane trying to keep it a secret but I'm really looking forward to seeing the look on my mum's face.
BBC: Olympic heroes head New Year Honours
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