A switching device used to open an electric circuit when there is no current through it. They are used to isolate a part of an electrical system to allow the maintenance staff a safe access to it.
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 return trip.
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.
An instance of flip-flopping, of repeatedly changing one's stated opinion about a matter.
A change of places; an inversion or swap.
The sound of a regular footfall.
A somersault.
To alternate back and forth between directly opposite opinions, ideas, or decisions.