What does “the half of it” mean?

used in negative sentences to say that a situation is worse or more complicated than sb thinks

How is “the half of it” used?

In Ant-Man (2015), one line is: “And you only know the half of it, Hank.”

The clip at the top of this page is from Ant-Man (2015).

And you only know the half of it, Hank.

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