suss

Short definition from Wiktionary

Noun

1. 1
   Alternative form of soss (“miry place”).
2. 2
   Suspicious behaviour; the act of loitering with intent.
3. 3
   Social nous.

Adjective

1. 1
   Suspicious.

Verb

1. 1
   To arrest for suspicious behaviour.
2. 2
   To discover, infer or figure out.
3. 3
   To study or size up, to check out (examine).

Proper noun

1. 1
   A surname