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:
In the English description:

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