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

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

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, from un- (2) + couple (v.). Cf. M.Du. ontcoppelen.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Don't uncouple the trailer if you're only spending the night and don't need to use your tow vehicle.
Couple or uncouple rolling stock to make up or break up trains.
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