thong

Concise Oxford English Dictionary © 2008 Oxford University Press:
thong/θɒŋ/

▶noun

• 1 a narrow strip of leather or other material, used especially as a fastening or as the lash of a whip.

• 2 a skimpy bathing garment or pair of knickers like a G-string.

• 3 N. Amer. & Austral. a light sandal or flip-flop.

– derivatives
thonged adjective,
thongy adjective.

– origin OE thwang, thwong, of Gmc origin.