noun
a spherical object used in various sports and games
verb
to form into a round shape or to make a mess of something
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Please do not ball up your papers, as they need to be neatly organized for the presentation.
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Hey, don't ball up that paper! We might need it later.
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I accidentally balled up my homework and now I can't find it anywhere.
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His anxiety was starting to ball up inside him, making it hard to focus on anything else.