WordReference Random House Unabridged Dictionary of American English © 2025
un•tack  (un tak),USA pronunciation v.t. 
  1. to unfasten (something tacked).
  2. to loose or detach by removing a tack or tacks.
  • un-2 + tack1 1635–45

'untack' also found in these entries (note: many are not synonyms or translations):

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