There are 2 definitions of untack in English:

untack1

Syllabification: un·tack
Pronunciation: /ˌənˈtak
 
/

verb

[with object]
Detach (something) by the removal of tacks.
More example sentences
  • On the other side of the bed she was hurriedly untacking the pictures she had drawn from the walls.
  • I untacked the paper from the wall and slipped it into my suitcase.

Definition of untack in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal

There are 2 definitions of untack in English:

untack2

Syllabification: un·tack
Pronunciation: /ˌənˈtak
 
/

verb

[with object]
Remove the saddle and bridle from (a horse).
More example sentences
  • One at a time, each horse was untacked and turned loose in my arena.
  • After you untack your horse, use water (warm water, if it is available) to sponge off the areas that have become sweaty - the saddle area, chest, and behind the tail are the areas where your horse is most likely to sweat.
  • They walked around the barn, dismounted, then untacked and groomed the horses again.

Definition of untack in:

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal