Etymology
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abut (v.)

mid-13c., "to end at, to border on, touch at the end," from Old French aboter, abuter "join end to end, touch with an end" (13c.), and abouter "join end to end," from à "to" (see ad-) + boter, bouter "to strike, push," from a Germanic source, from Proto-Germanic *buttan, from PIE root *bhau- "to strike." Compare butt (v.). Related: Abutted; abutting.

Origin and meaning of abut

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Definitions of abut

abut (v.)
lie adjacent to another or share a boundary;
Synonyms: border / adjoin / edge / march / butt / butt against / butt on
From wordnet.princeton.edu