The definition of abut is to touch or be next to something.(verb)
An example of abut is the shoulder that borders a road.
See abut in Webster's New World College Dictionary
See abut in American Heritage Dictionary 4
verb a·but·ted, a·but·ting, a·buts verb, intransitive
Origin: Middle English abutten
Origin: , from Old French abouter, to border on (a-, to from Latin ad-; see ad- + bouter, to strike; see bhau- in Indo-European roots)
Origin: and from Old French abuter, to end at (from but, end; see butt4).
Learn more about abut