a pin, bolt, or rod placed transversely through a chain, an eye or loop in a rope, etc., as to bind it temporarily to another chain or rope similarly treated.
a toggle joint, or a device having one.
an ornamental, rod-shaped button for inserting into a large buttonhole, loop, or frog, used especially on sports clothes.
Also called toggle rail. a wooden batten across the width of a flat, for strengthening the frame.
Also called toggle iron. a metal device for fastening a toggle rail to a frame.
verb (used with object), toggled, toggling.
to furnish with a toggle.
to bind or fasten with a toggle.
Informal. to turn, twist, or manipulate a toggle switch; dial or turn the switch of (an appliance): He toggled the TV between the baseball game and the news.

1760–70; perhaps variant of tackle

toggler, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
toggle (ˈtɒɡəl)
1.  a wooden peg or metal rod fixed crosswise through an eye at the end of a rope, chain, or cable, for fastening temporarily by insertion through an eye in another rope, chain, etc
2.  a wooden or plastic bar-shaped button inserted through a loop for fastening
3.  a pin inserted into a nautical knot to keep it secure
4.  machinery a toggle joint or a device having such a joint
vb (often foll by between)
5.  (tr) to supply or fasten with a toggle or toggles
6.  computing to switch to a different option, view, application, etc
[C18: of unknown origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1769, "short pin passed through the eye of a rope," a nautical word of uncertain origin, perhaps a frequentative form of tog "tug." Meaning "a kind of wall fastener" is recorded from 1934. Toggle bolt is from 1794; toggle switch first attested 1938.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

toggle definition

To change a bit from whatever state it is in to the other state; to change from 1 to 0 or from 0 to 1. This comes from "toggle switches", such as standard light switches, though the word "toggle" actually refers to the mechanism that keeps the switch in the position to which it is flipped rather than to the fact that the switch has two positions. There are four things you can do to a bit: set it (force it to be 1), clear (or zero) it, leave it alone, or toggle it.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Once the car is warmed up, she flips a fuel toggle on the dashboard to switch
  to the vegetable oil.
The crisis has now turned the toggle switch, because risk perception among
  investors has changed.
When instructed, you activate that new frequency by pushing one toggle switch.
And the do- hickey on the back of a shirt stud is a toggle.
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