Definition of suss verb from the Oxford Advanced American Dictionary

 

suss

 verb
verb
NAmE//sʌs//
 
[transitive, intransitive]suss (somebody/something) (out)(informal)Verb Forms present simple I / you / we / they suss
 
he / she / it susses
 
past simple sussed
 
-ing form sussing
 
 
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to realize something; to understand the important things about someone or something If you want to succeed in business you have to suss out the competition. He cheated on her for years, but she never sussed.
See the Oxford Advanced Learner's Dictionary entry: suss