Webster's English Dictionary

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lessen

Cross references:
  1. decrease              
 
less.en \'les-*n\ \'les-nin, -*n-in\ vb or less.en.ing : to shrink in size, 
   number, or degree : DECREASE  1: to reduce in size, extent, or degree  
   archaic  2a: MINIMIZE  obs  2b: to lower in status or dignity : DEGRADE