UNTACK
Meaning of UNTACK in English
/un tak"/ , v.t.
1. to unfasten (something tacked).
2. to loose or detach by removing a tack or tacks.
[ 1635-45; UN- 2 + TACK 1 ]
Random House Webster's Unabridged English dictionary.
Полный английский словарь Вебстер - Random House .
2012