make head or tail of
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make head or tail (out) of (someone or something)
To understand someone or something. This phrase is usually used in the negative to convey the opposite. After spending hours working with the new piece of software, I still could not make head or tail out of it. I can't make head or tail of that new guy in accounting. Sometimes, he's really friendly, and then other times he acts like he's never met me before.
make head or tail ofunderstand at all.
1994 S. P. Somtow Jasmine Nights I'm…trying to puzzle out why he has turned his animosity on me instead of those who are clearly his enemies. I can't make head or tail of it.