- verb to discover or understand something such as somebody’s reason for doing something, a situation or the correct way to use something
- adjective suspect or suspicious
- noun ‘knowhow’, ‘savvy’. A usage in currency since the 1970s, based on suss (out).
- noun suspicion. The much criticised Vagrancy Act, under whose provisions (young) people could be arrested for ‘loitering with intent (to commit an arrestable offence)’, was known as ‘the sus law’. ‘On sus(s)’ refers to being taken into custody on suspicion of committing an offence.