worm

(noun) any of numerous relatively small elongated soft-bodied animals especially of the phyla Annelida and Chaetognatha and Nematoda and Nemertea and Platyhelminthes; also many insect larvae.

(noun) a person who has a nasty or unethical character undeserving of respect. Synonyms: louse, insect, dirt ball.

(noun) a software program capable of reproducing itself that can spread from one computer to the next over a network. Example: "Worms take advantage of automatic file sending and receiving features found on many computers."

(noun) screw thread on a gear with the teeth of a worm wheel or rack.

(verb) to move in a twisting or contorted motion, (especially when struggling). Synonyms: writhe, wrestle, wriggle, squirm, twist. Examples: "The prisoner writhed in discomfort." "The child tried to wriggle free from his aunt's embrace."