flu
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Learner's definition of FLU
[noncount]
:
a common disease that is caused by a virus and that causes fever, weakness, body aches, and breathing problems
:
influenza
— often used before another noun
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He came down with a bad bout/attack/case of the flu.
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catch/get the flu
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She has the flu. = (Brit) She has flu.
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the flu season
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a flu shot
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a flu epidemic
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