verb (used with object), unbound, unbinding.
to release from bonds or restraint, as a prisoner; free.
to unfasten or loose, as a bond or tie.

before 950; Middle English unbinden, Old English unbindan; cognate with German entbinden. See un-2, bind

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World English Dictionary
unbind (ʌnˈbaɪnd)
vb , -binds, -binding, -bound
1.  to set free from restraining bonds or chains; release
2.  to unfasten or make loose (a bond, tie, etc)

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

O.E. unbindan, "to free from binding," from un- (2) + bind. Cf. Ger. entbinden, Du. ontbinden. Lit. and fig. senses both present in O.E.
"Suæ huæt ðu unbindes ofer eorðu bið unbunden in heofnum." [Lindisfarne Gospels, Matt. XVI.19]
Unbound is from O.E. unbunden, in literal sense. Figurative sense first attested late 14c.; of books from 1540s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
We must develop the clean energy that can power new industry, unbind us from foreign oil, and preserve our planet.
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