Quick definitions from WordNet (buttonhole)
▸ noun: a hole through which buttons are pushed
▸ verb: detain in conversation by or as if by holding on to the outer garments of; as for political or economic favors
▸ Also see buttonhole
▸ noun: a hole through which buttons are pushed
▸ verb: detain in conversation by or as if by holding on to the outer garments of; as for political or economic favors
▸ Also see buttonhole