Pronunciation IPA (key): /'wiːzəl/ Audio (US)(file) Noun Singular weasel Plural weasels (countable) A weasel is a small, thin animal that eats meat. Pop goes the weasel! (countable) (informal) A weasel is a sneaky or dishonest person, someone you cannot trust. That little weasel took all my money! Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads