Serve his purpose - Idioms by The Free Dictionary
serve (one's) purpose (redirected from serve his purpose)
serve (one's) purpose
To fit or satisfy someone's requirements; to be useful for or fit to achieve someone's aim, goal, or purpose. Well, it isn't a very pretty car, but it should serve our purpose just fine. Child: "But mom, I want a smartphone!" Mother: "Nonsense, the cell phone you already have serves your purpose just fine."
serve a, his, its, etc. ˈpurpose,
serve the ˈpurpose (of doing something) (British English also serve his, its, etc. ˈturn) be useful for a particular purpose or period of time; be good or useful enough for somebody: It’s not a very good radio, but it serves its purpose. ♢ He used his friends and then abandoned them when they had served their turn.
References in classic literature
Mr Watson now bespoke the most extravagant supper he could well think of; and though he had contented himself with simple claret before, nothing now but the most precious Burgundy would serve his purpose
This is the man whom Californians fear when they voice even tepid support for the death penalty - the man who lacks empathy, knows no remorse, and won't hesitate to kill again should it serve his purpose