Definition of suss out
British, informal
1
: to find or discover (something) by thinking
They had to suss out whether he was telling the truth. I'm trying to suss him out. What kind of person is he? I think I've got him sussed out.
2
: to inspect or investigate (something) in order to gain more knowledge
He carefully sussed out the situation.
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Merriam-Webster unabridged
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