Definition of “not know the half of it” - English Dictionary

british dictionary

“not know the half of it” in British English

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not know the half of it

also have not heard the half of it informal

If someone does not know the half of it, they know that a situation is bad but do not know how serious it is:

"I hear things aren't going too well at work." "You don't know the half of it!"

(Definition of “not know the half of it” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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