untack

[ uhn-tak ]
/ ʌnˈtæk /

verb (used with object)

to unfasten (something tacked).
to loose or detach by removing a tack or tacks.

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Origin of untack

First recorded in 1635–45; un-2 + tack1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for untack