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What does "curl up" mean?

  1. Assume a position with the legs drawn up; settle down for sleep in this posture. For example, I love to curl up with a good book. [c. 1900]
  2. curl up and die. Retreat, collapse, die, as in At first the horse was ahead but in the home stretch she curled up and died, or I'll just curl up and die if he shows up. This colorful expression for collapsing or dying is often used hyperbolically (second example). [Early 1900s]
  3. curl someone up. Kill someone, as in The sheriff said he'd curl up that outlaw. This usage originated as cowboy slang in the second half of the 1800s.

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