flunoun [ U ]uk /fluː/ us /fluː/ formal influenza
a flu virus
to catch/get/have (the) flu
- She's very hot and shivery, so I think she must have flu.
- There are lots of people off school this week with flu.
(Definition of “flu” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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to (cause someone to) be in a position in which the lower part of the body is resting on a seat or other type of support, with the upper part of the body vertical