flip-flop

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.

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

A change of places; an inversion or swap.

On the break for strong left, everything remains the same, except for the flip-flop of positions.

BR's flip-flop attitude towards the two options can be observed in comments made by the BR chairman in September 1967, which were interpreted as meaning that the facts now have to be "adjusted" to prove the electrification case.

A change of places; an inversion or swap.

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

Ten two-state flip-flops […] were formed into ten-stage ring counters representing each decimal digit in the ten-digit accumulators […]

The sound of a regular footfall.

To alternate back and forth between directly opposite opinions, ideas, or decisions.