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crumble up

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crumble something up (into something)

to crunch up or break up something into pieces. Now, crumble the dried bread up into crumbs. Crumble up the bread into crumbs.

See also: crumble, up

crumble up

to break up into little pieces. The cake, which was very dry, crumbled up when I tried to cut it. The paper of the old book crumbled up when I turned the pages.

See also: crumble, up