After all, flu dilly-dallied last season, barely making a peep.
All immunizations, including the one for the flu, come with side effects.
Blister rust is like having the flu; the pine beetle is like fast acting leukemia.
1839, flue, shortening of influenza. Spelling flu attested from 1893. For choice of middle syllable, not a common method of shortening in English, Weekley compares tec for detective, scrip for subscription.