button-hole (n.)youdaoicibaDictYouDict[button-hole 词源字典]
1560s, from button (n.) + hole (n.). The verb, also buttonhole, meaning "to detain (someone) in conversation against his will" (1862) was earlier button-hold (1834), from button-holder (1806, in this sense). The image is of holding someone by the coat-button so as to detain him.[button-hole etymology, button-hole origin, 英语词源]