Longman Dictionary of Contemporary English homepage

suss

 verb
     
suss also suss somebody/something ↔ out [transitive]
British English informal to realize or discover something, or to find out the things that you need to know about someone or something:
He finally sussed out the truth.
suss (that)
I soon sussed that she wasn't telling the truth.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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