—n.
1 a narrow strip of hide or leather used as the lash of a whip, as a halter or rein, etc.
2 Austral., NZ, & US = FLIP-FLOP.
—v.tr.
1 provide with a thong.
2 strike with a thong.
Etymology: OE thwang, thwong f. Gmc
Useful english dictionary. 2012.