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同义词： close up dummy up shut up belt up button up be quiet keep mum
以上来源于: WordNet
V to keep or become silent or withhold information 拒不开口 [非正式]
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Will you clam up! The boss is talking.
请你保持安静！老板在说话。
You can't clam up.
你不能沉默。
More than almost anything, I would like Lady Gaga to clam up for a while.
FORBES: Dear Justin Timberlake and Lady Gaga: Please don't make me choose
Do we really want employees to clam up, in fear of future liability, instead of discussing their concerns?
FORBES: Justice Dept.'s S&P Suit Long On Chatter, Short On Substance
If you tend to clam up in social settings, try having a few topics and answers ready to discuss.
FORBES: Rookie Mistakes: 5 Extremes to Avoid at Work
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