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2 definitions found

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

 slack up
 (v.)減弱,減退

From: WordNet (r) 2.0

 slack up
      v : make less active or fast; "He slackened his pace as he got
          tired"; "Don't relax your efforts now" [syn: slack, slacken,
           relax]