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toggle vt.
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. (Mathematically, one would
say that there are four distinct boolean-valued functions of one
boolean argument, but saying that is much less fun than talking
about toggling bits.)
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