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You don't know the half of it

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You don't know the half of it.

Inf. You really don't know how bad it is.; You might think that what you have heard is bad, but you do not know the whole story. Mary: They say you've been having a bad time at home. Sally: You don't know the half of it. Sally: The company has no cash, they are losing orders right and left, and the comptroller is cooking the books. Mary: Sounds bad. Sally: You don't know the half of it.

See also: half, know, of