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2 definitions found

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

 double up
 把…對折;彎曲身子

From: WordNet (r) 2.0

 double up
      v 1: bend over or curl up, usually with laughter or pain; "He
           doubled and vomited violently" [syn: double over, double]
      2: share a room or a bed designed for only one person
      3: stake winnings from one bet on a subsequent wager [syn: parlay]