Moved slowly on hands and knees, or moved very slowly in general.
From Old Norse 'krafla' meaning 'to claw.' The word originally described the scratching crawling motion, emphasizing the hand-and-foot movement.
Babies crawl before they walk because crawling uses the same 'cross-pattern' movement as four-legged animals—our evolutionary ancestors—so crawling is actually our oldest motor skill hiding inside our modern bodies.
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