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English definition of “fat”

fat

adjective [before noun] (NO)    /fæt/ (fatter, fattest) informal
used in some phrases to mean very little or none: A fat lot of use you are! (= You are not useful in any way.) He knows it upsets me, but a fat lot he cares (= he doesn't care ).Something, anything, nothing, and everything
(Definition of fat adjective (NO) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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