Meaning of “flu” in the English Dictionary

british dictionary

"flu" in British English

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flunoun [ U ]

uk /fluː/ us /fluː/ formal influenza

B1 a common infectious illness that causes fever and headache:

a flu virus
to catch/get/have (the) flu

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(Definition of “flu” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"flu" in American English

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flunoun [ U ]

us /flu/

esp. fml influenza, /ˌɪn·fluˈen·zə/ an infectious illness like a very bad cold that also causes a fever:

Robby has a bad case of the flu.

(Definition of “flu” from the Cambridge Academic Content Dictionary © Cambridge University Press)

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