: a small piece of wood, plastic, metal, etc., that is pushed through a loop or hole to fasten one part of something to another part
computers : a setting that can be switched between two different options by pressing a single key, making a single choice from a menu, etc.
Full Definition of TOGGLE
: a piece or device for holding or securing: as
a: a pin inserted in a nautical knot to make it more secure or easier to slip
b: a crosspiece attached to the end of or to a loop in something (as a chain, rope, line, strap, or belt) usually to prevent slipping, to serve in twisting or tightening, or to hold something attached
: a device consisting of two bars jointed together end to end but not in line so that when a force is applied to the joint tending to straighten it pressure will be exerted on the parts adjacent or fixed to the outer ends of the bars; also: a device with a joint using a toggle