flea /ˈfliː/noun 2verb 1forms 5phrases 1 noun2 •A small, wingless, parasitic insect of the order Siphonaptera, renowned for its bloodsucking habits and jumping abilities. •A thing of no significance. verb1 •To remove fleas from (an animal).I have seen a Lubra, or native woman, suckling two puppies; and, like monkeys, these ladies have a particular fancy for fleaing their dogs. — 1861 formsflead · fleaed · fleaing · fleas · fleen Phrases with flea flea in one's earA stinging rebuke or rebuff.