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uncouple

[uhn-kuhp-uh l] /ʌnˈkʌp əl/
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
1300-1350
1300-50; Middle English unco(u)plen; see un-2, couple
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for uncouple
  • 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.
British Dictionary definitions for uncouple

uncouple

/ʌnˈkʌpəl/
verb
1.
to disconnect or unfasten or become disconnected or unfastened
2.
(transitive) to set loose; release
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for uncouple
v.

c.1300, from un- (2) "opposite of" + couple (v.). Cf. Middle Dutch ontcoppelen. Related: Uncoupled; uncoupling.

Online Etymology Dictionary, © 2010 Douglas Harper
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