Other forms: buttonholes
A buttonhole is the slit a button passes through. Stitch the buttonhole, a flower in his buttonhole, a fraying buttonhole.
It must be sewn round or it frays open, and a hand-worked one is a mark of a good tailor. In Britain a buttonhole is also the flower worn in the lapel at a wedding. As a verb, to buttonhole somebody is to corner them and make them listen.
buttonhole is an opening.
Originally buttonhold, a loop that held a button, reshaped towards hole.
Built from
Originally buttonhold (“a loop of string to hold a button down”), but changed by folk etymology by influence of hole. by surface analysis, button + hole.
Etymology from Wiktionary, CC BY-SA