a·but (?-b?t?)v. a·but·ted, a·but·ting, a·buts v.intr. To touch or end at one end or side; lie adjacent.v.tr.1. To border upon or end at; be next to.2. To support as an abutment.[Middle English abutten, from Old French abouter, to border on (a-, to from Latin ad-; see ad- + bouter, to strike; see bhau- in Indo-European roots) and from Old French abuter, to end at (from but, end; see butt4).]a·but?ter n.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.