Webster's English Dictionary

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slacken

Cross references:
  1. delay                 
 
slack.en \'slak-*n\ \-(*-)nin\ vb or slack.en.ing 1: to make less active : 
   slow up : MODERATE, RETARD {@ speed at a crossing} 2: to make slack (as by 
   lessening tension or firmness) : LOOSEN (~ sail} 1: to become slack or slow 
   or negligent : slow down  2: to become less active : SLACK