the word 'triggerman' is a modern english compound, originating in the early 20th century american underworld slang. its first element, 'trigger', derives from the dutch 'trekker' (meaning 'pull'), which entered english via the mechanism of a firearm, referring to the lever that releases the firing mechanism. the second element, 'man', is from the old english 'mann', a common agentive suffix denoting a person performing a specific role. the compound literally means 'the man who pulls the trigger', a starkly literal description for a hired assassin. over time, its usage expanded metaphorically to denote anyone who initiates a decisive action, linking the physical act of firing a gun to the abstract concept of setting events in motion.

Structure: trigger + man trigger (from dutch trekker, meaning 'pull, draw', functioning as the core action element) + man (from old english mann, meaning 'person, human being', functioning as an agent noun suffix).