(also sus ) / sʌs; NAmE / verb
suss (sb/sth) (out) ( BrE , informal ) to realize sth; to understand the important things about sb/sth :
[ vn ]
I think I've got him sussed (= now I understand him) .
If you want to succeed in business you have to suss out the competition.
[ v ]
He cheated on her for years, but she never sussed.
[also v that , v wh- ]
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WORD ORIGIN
1930s: abbreviation of suspect , suspicion .