suss 
/ˈsʌs/ verb
suss·es; sussed; suss·ing /ˈsʌs/ verb [+ obj] Brit, informal 1 : to find or discover (something) by thinking — usually + out ▪ They had to suss out [=figure out] whether he was telling the truth. ▪ I think I've got him sussed out. [=I understand what kind of person he is] 2 : to inspect or investigate (something) in order to gain more knowledge — usually + out ▪ He carefully sussed out the situation.
