flu — Health and Illness flu /fluː/ noun CEFR A2 An illness like a bad cold that causes fever and tiredness. “He is in bed with the flu.” Related words in this scene medicinetireddoctornursecoldillnessfevercoughheadachepainsickillhurtachestomachachetoothachesore throathospitaltemperaturerestsneezedizzyinjectiontabletpillbandagebetterrashsoreplasterthermometerrecover Practice this word Create worksheet