un·cou·ple

[uhn-kuhp-uhl] verb, un·cou·pled, un·cou·pling.
verb (used with object)
1.
to release the coupling or link between; disconnect; let go: to uncouple railroad cars.
verb (used without object)
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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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
uncouple (ʌnˈkʌpəl) [Click for IPA pronunciation guide]
 
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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00:10
Uncouple is one of our favorite verbs.
So is peculate. Does it mean:
to swindle, cheat, hoodwink, or hoax.
to steal or take dishonestly (money, esp. public funds, or property entrusted to one's care); embezzle.
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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Example sentences
Couple or uncouple rolling stock to make up or break up trains.
Don't uncouple the trailer if you're only spending the night and don't need to use your tow vehicle.
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