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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 clam up
 守口如瓶,一聲不吭

From: WordNet (r) 2.0

 clam up
      v : refuse to talk or stop talking; fall silent; "The children
          shut up when their father approached" [syn: close up, dummy
           up, shut up, belt up, button up, be quiet, keep
           mum] [ant: open up]