Walking without lifting your feet fully off the ground, or mixing cards in random order.
From Middle English 'schuffen,' possibly from Scandinavian roots meaning 'to shove.' The word likely came from the movement of dragging feet along the ground, then expanded to describe any random rearrangement.
Card shuffling is actually a perfect example of creating randomness—magicians spent centuries perfecting shuffles to control cards, which is why casinos now use automatic shufflers to prevent cheating!
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