Webster's English Dictionary

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flatten

flat.ten \'flat-*n\ \'flat-nin, -*n-in\ \'flat-n*r, -*n-*r\ vb or 
   flat.ten.ing 1: to make flat : as  1a: LEVEL, SMOOTH  1b: to lay low : RUIN 
    2: to make (as paint) lusterless  1: to become flat or flatter  2a: to 
   manipulate an airplane so as to bring its longitudinal axis paralle l with 
   the ground - used with out of an airplane  2b: to assume such a position  - 
   flat.ten.er n