stack

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Noun[change]

Singular
stack

Plural
stacks

  1. A pile of something similar.
    There is a stack of books outside. Are those yours?

Verb[change]

Plain form
stack

Third-person singular
stacks

Past tense
stacked

Past participle
stacked

Present participle
stacking

  1. When you stack something, you put something similar on top of one another to form a pile.
    I stacked up the books at one side.