Hypertext Webster Gateway: "unscrew"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unscrew \Un*screw"\, v. t. [1st pref. un- + screw.]
To draw the screws from; to loose from screws; to loosen or
withdraw (anything, as a screw) by turning it.
From WordNet (r) 1.7 (wn)
unscrew
v 1: loosen something by unscrewing it; "unscrew the outlet
plate" [ant: {screw}]
2: loosen by turning; "unscrew the bottle cap" [ant: {screw}]
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