uncoupling

uncouple

[uhn-kuhp-uhl]
verb (used with object), uncoupled, uncoupling.
1.
to release the coupling or link between; disconnect; let go: to uncouple railroad cars.
verb (used without object), uncoupled, uncoupling.
2.
to become unfastened; let go: The glider uncoupled from the tow plane.

Origin:
1300–50; Middle English unco(u)plen; see un-2, couple

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World English Dictionary
uncouple (ʌnˈkʌpəl)
 
vb
1.  to disconnect or unfasten or become disconnected or unfastened
2.  (tr) to set loose; release

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

uncouple
c.1300, from un- (2) + couple (v.). Cf. M.Du. ontcoppelen.
Online Etymology Dictionary, © 2010 Douglas Harper
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