Princeton's WordNet

1. earthworm, angleworm, fishworm, fishing worm, wiggler, nightwalker, nightcrawler, crawler, dew worm, red worm(noun)

   terrestrial worm that burrows into and helps aerate soil; often surfaces when the ground is cool or wet; used as bait by anglers

Wiktionary

1. earthworm(Noun)

   A worm that lives in the ground; a worm of Lumbricidae family, or, more generally, of Lumbricina suborder.

2. earthworm(Noun)

   A disparaging reference to a person, particularly one who grovels.

3. earthworm(Noun)

   A figurative reference to death.

Webster Dictionary

1. Earthworm(noun)

   any worm of the genus Lumbricus and allied genera, found in damp soil. One of the largest and most abundant species in Europe and America is L. terrestris; many others are known; -- called also angleworm and dewworm

2. Earthworm(noun)

   a mean, sordid person; a niggard

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