WordReference Random House Learner's Dictionary of American English © 2017
a•but /əˈbʌt/USA pronunciation   v.,  a•but•ted, a•but•ting. 
  1. to be adjacent;
    touch or join at the edge or border: [+ on/upon/against + object]The garden abuts on the next yard.[+ object]The garden abuts the next yard.

WordReference Random House Unabridged Dictionary of American English © 2017
a•but  (ə but),USA pronunciation v.,  a•but•ted, a•but•ting. 
  1. to be adjacent;
    touch or join at the edge or border (often fol. by on, upon, or against):This piece of land abuts on a street.

  1. to be adjacent to;
    border on;
    end at.
  2. to support by an abutment.
  • Middle French, Old French abuter touch at one end, verb, verbal derivative of a but to (the) end; see a-5, butt2
  • late Middle English 1425–75

Collins Concise English Dictionary © HarperCollins Publishers::

abut /əˈbʌt/ vb (abuts, abutting, abutted)
  1. usually followed by on, upon, or against: to adjoin, touch, or border on (something) at one end
Etymology: 15th Century: from Old French abouter to join at the ends, border on; influenced by abuter to touch at an end, buttress

'abut' also found in these entries:

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