not add up definition, meaning - what is not add up in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “not add up”

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not add up

informal
If a situation does not add up, there is no reasonable or likely explanation for it: Why would she disappear the day before her holiday? It just doesn't add up.
(Definition of not add up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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