TOGGLE

A wooden or metal pin, short rod, crosspiece or similar, fixed transversely in the eye of a rope or chain to be secured to any other loop, ring, or bight, e.g. a sea painter to a lifeboat.

(in particular) A rod-shaped button bound with slack to the fabric.

A toggle switch.

To alternate between two positions using a single switch or lever.

"Clicking a button will alternately toggle its light on OR off."

To switch between alternate states.

"You can quickly toggle the case of selected text by pressing Alt+C."

To fix like a toggle iron; to fix fast.