Real Dictionary

worm
countable noun: A worm is a small animal with a long thin body, no bones and no legs.
plural noun: If animals or people have worms, worms are living in their intestines.
singular noun: If you call a person a worm, you are insulting them by saying that they have a very weak or unpleasant character and you have no respect for them.
verb: If you say that someone is worming their way to success, or is worming their way into someone else's affection, you disapprove of the way that they are gradually making someone trust them or like them, often in order to deceive them or gain some advantage
verb: If you worm an animal, you give it medicine in order to kill the worms that are living in its intestines.
verb: If you worm your way somewhere, you move there with difficulty, twisting or bending your body or making it narrow.

worm in American English
any of many slender, soft-bodied animals, some segmented, that live by burrowing underground, in water, or as parasites, including the annelids, nemerteans, nematodes, platyhelminths, acanthocephalans, and gordian worms
intransitive verb: to move or act like a worm; creep, crawl, or advance slowly or stealthily
noun: any of numerous long, slender, soft-bodied, legless, bilaterally symmetrical invertebrates, including the flatworms, roundworms, acanthocephalans, nemerteans, gordiaceans, and annelids
transitive verb: to cause to move or advance in a devious or stealthy manner

worm in British English
worm
noun: any of various invertebrates, esp the annelids (earthworms, etc), nematodes (roundworms), and flatworms, having a slender elongated body
noun acronym for: write once read many times: an optical disk that enables users to store data but not change it
verb: to move, act, or cause to move or act with the slow sinuous movement of a worm