butt 2 
(bŭt)
(bŭt)tr. & intr.v. butt·ed, butt·ing, butts
To join or be joined end to end; abut.
n.
1. A butt joint.
2. A butt hinge.
[Middle English butten, from Anglo-Norman butter (variant of Old French bouter; see BUTT1) and from but, end; see BUTT4.]