The word 'suss' is a 20th-century British slang term, originating as a shortened form of 'suspect' or 'suspicion'. Its development follows a common pattern in informal language where longer words are clipped for speed and efficiency, often acquiring a more active, verbal sense in the process. From initially relating to being suspicious of someone or something, its meaning broadened to the more general sense of figuring something out or investigating. This evolution reflects the dynamic and adaptive nature of colloquial speech, where utility and conciseness drive semantic change.

This word is a simplex form derived from clipping and alteration.