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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