unpinning

unpin

[uhn-pin]
verb (used with object), unpinned, unpinning.
1.
to remove pins from.
2.
to unfasten or loosen by or as if by removing a pin; detach.

Origin:
1300–50; Middle English unpynnen to unbolt; see un-2, pin

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World English Dictionary
unpin (ʌnˈpɪn)
 
vb , -pins, -pinning, -pinned
1.  to remove a pin or pins from
2.  to unfasten by removing pins

Collins English Dictionary - Complete & Unabridged 10th Edition
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