Verb scrunch up has 2 senses
  1. squat, crouch, scrunch, scrunch up, hunker, hunker down - sit on one's heels; "In some cultures, the women give birth while squatting"; "The children hunkered down to protect themselves from the sandstorm"
    --1 is one way to sit, sit down
    Sample sentences:
    Something ----s
    Somebody ----s
    Somebody ----s PP
  2. wrinkle, ruckle, crease, crinkle, scrunch, scrunch up, crisp - make wrinkles or creases into a smooth surface; "The dress got wrinkled"
    --2 is one way to fold, fold up, turn up
    Sample sentence:
    They scrunch up the sheets
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