Webster's English Dictionary

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abut

abut \*-'b*t\ vb or abut.ted;  or abut.ting [ME abutten, partly fr. OF 
   aboter to border on, fr. a- (fr. L] ad-) + bout blow, end, fr. boter to 
   strike; partly fr. OF abuter to come to an end, fr. a- + but end, aim - 
   more at 1BUTT, 3BUTT 1: to touch along a border or with a projection part 
   {land ~sX on the road} 2a: to terminate at a point of contact  2b: to lean 
   for support  : to border on : TOUCH  - abut.ter n