nightcrawler Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a type of large earthworm that is active at night and is often used as bait for fishing. Example Sentence I saw a nightcrawler in the garden. More Example Sentences They used a nightcrawler for fishing. Synonyms earthworm; bait; worm Antonyms dayworm; diurnal worm Hear It! Say It! Write It! nightcrawler Switch to cursive Start Share with your friends: