a ‧ but /əˈbʌt/ BrE AmE ( also abut on ) verb ( past tense and past participle abutted , present participle abutting ) [transitive] formal
[ Date: 1400-1500 ; Origin: Partly from Old French aboter 'to share a border with' , from bout 'act of hitting, end' , from boter 'to hit' ; partly from Old French abuter 'to come to an end' , from but 'end, aim' ]
if one piece of land or a building abuts another, it is next to it or touches one side of it ⇨ adjoin