flip-flop
/ˈflɪpˌflɒp/
An instance of flip-flopping, of repeatedly changing one's stated opinion about a matter.
A bistable; an electronic switching circuit that has either two stable states (switching between them in response to a trigger) or a stable and an unstable state (switching from one to the other and back again in response to a trigger), and which is thereby capable of serving as one bit of memory.
A sandal consisting of a rubber sole fastened to the foot by a rubber thong fitting between the toes and around the sides of the foot.
2004: the necessity for yet another place at which to buy a polo shirt or a pair of flip-flops may not be apparent to the town's residents — The New Yorker, 30 August 2004, p.38
A change of places; an inversion or swap.
The sound of a regular footfall.