flu
nounUK /fluː/
US /fluː/
A sickness that makes you feel hot, tired, and achy.
She stayed home from school because she had the flu.
RELATED WORDS
OTHER MEANINGS
2. A short form of influenza, a serious viral infection of the breathing system.
Doctors recommend a flu shot every autumn.
3. A sudden outbreak or wave of something spreading quickly.
A flu of rumors spread through the office.
4. Informal use for a bad cold with fever and body aches.
He caught a nasty flu and missed a week of work.