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From The Collaborative International Dictionary of English v.0.48:
nightcrawler \nightcrawler\ n. A terrestrial worm that burrows into and helps aerate soil; an earthworm. It often surfaces when the ground is cool or wet, and is used as bait by anglers. The term is used mostly in the northern and western U. S. Syn: earthworm, angleworm, fishworm, fishing worm, wiggler, nightwalker, dew worm, red worm. [WordNet 1.5]