IPA: /ʌnˈstæk/
KK: /ʌnˈstæk/
To take items off a pile or stack, usually to separate them or make them easier to access.
She decided to unstack the boxes to find the one she needed.
Past: unstacked
Past Participle: unstacked
Unstack → It is formed from "un-" (meaning not or the opposite of) and "stack" (from Old English "stacian", meaning to arrange or pile). The word "unstack" means to remove or take apart a stack or pile.
Think of 'not stacking' something — 'un-' means not, and 'stack' refers to a pile. This helps you remember that 'unstack' means to take something apart from a pile.