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suss someone out
Sl. to try to figure someone out. I can't seem to suss Tom out. What a strange guy. I don't have any luck sussing out people I don't know well.
1. To infer or discover something; figure something out: The spy sussed out our plans before we began. I don't know his intentions, but I plan to suss them out.
2. To study and evaluate someone; size someone up: They sussed me out and decided I was trustworthy. She's good at sussing out people who apply for the job.