1 : underpants resembling a G-string; worn by women especially under very tight pants; "she wore thongs in her quest for the callipygian ideal"
2 : minimal clothing worn by stripteasers; a narrow strip of fabric that covers the pubic area, passes between the thighs, and is supported by a waistband
3 : a backless sandal held to the foot by a thong between the big toe and the second toe
4 : leather strip that forms the flexible part of a whip
