Hypertext Webster Gateway: "unpin"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Unpin \Un*pin"\, v. t. [1st pref. un- + pin.]
To loose from pins; to remove the pins from; to unfasten; as,
to unpin a frock; to unpin a frame.
From WordNet (r) 1.7 (wn)
unpin
v : remove the pins from; unfasten the pins of [ant: {pin}]
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