You don’t know the half of it

not know the half of it

To know a small part of how bad something is, but without understanding the complete situation; to underestimate or be uninformed about how bad a situation really is. Our bosses think that this is a major setback, but they don't know the half of it. We're months, not weeks, behind schedule! A: "I heard you and Terry were going through a tough time." B: "Oh, you don't know the half of it."
See also: half, know, not, of
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

You don’t know the half of it

sent. Things are far more complicated than you think. You don’t know the half of it, and I’m too much a lady to tell.
See also: half, know, of
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
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