Webster's English Dictionary

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fatten

fat.ten \'fat-*n\ \'fat-nin, -*n-in\ \'fat-n*r, -*n-*r\ vb or fat.ten.ing 
   1a: to make fat, fleshy, or plump  1b: to make more substantial  2: to make 
   fertile  : to grow fat  - fat.ten.er n