Third person singular present tense of crumple; wrinkles, crushes, or compresses something into folds and creases.
From 'crumple,' a verb with Old English and Germanic roots; the '-s' ending is the standard third-person singular present tense marker in English.
Watch how quickly a piece of paper 'crumples'—it demonstrates one of those satisfying verbs where you can almost feel the action happening, which is why onomatopoetic-sounding words like this one stick in memory.
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