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not know the half of it

(also have not heard the half of it) informal

Definition

If someone does not know the half of it, they know that a situation is bad but they 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!"Unaware
(Definition of not know the half of it from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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