Suss out

We've sussed him out—he only drinks on Fridays and only in that bar in town.

In essence, security experts most familiar with this breach believe that a nation-state — likely China or Russia — stole the data in order to suss out current spies and pick out potential targets they could recruit as spies.

We've sussed out how to open the lock.

You sussed it out, didn't you?

As far as electric cars are concerned, motorists have sussed out that they do not make particularly good financial sense, even with a $7,500 handout from the federal government.