toggle

Concise Oxford English Dictionary © 2008 Oxford University Press:
toggle/ˈtɒɡl/

▶noun

• 1 a short plastic or wooden rod attached to one side of a garment, pushed through a loop on the other side to act as a fastener.

  ■ a pin or other crosspiece put through the eye of a rope or a link of a chain to keep it in place.

  ■ (also toggle bolt) a wall fastener for use on open-backed plasterboard, having a part that springs open or turns through 90° after it is inserted.

• 2 Computing a key or command that is operated the same way but with opposite effect on successive occasions.

▶verb

• 1 Computing switch from one effect, feature, or state to another with a toggle.

• 2 provide or fasten with a toggle or toggles.

– origin C18 (orig. in naut. use): of unknown origin.