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3. know the half of it

know the half of it

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not know the half of it

  (informal) 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 they do not know how bad it is Tom's not happy with the situation and he doesn't even know the half of it! 'I hear you're having a few problems with the new guy'. 'A few problems? You haven't heard the half of it!'

See also: half, know, of