Webster's English Dictionary

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thump

1. thump \'th*mp\ vb [imit.] 1: to strike or beat with or as if with 
   something thick or heavy so as to  cause a dull sound 2: POUND, KNOCK  3: 
   CUDGEL, THRASH  : to inflict or emit a thump 
2. thump n : a blow or knock with or as if with something blunt or heavy; 
   also  : the sound made by such a blow