volunteer
vol·un·teer / ˌvälənˈtir/ • n. a person who freely offers to take part in an enterprise or undertake a task. ∎ a person who works for an organization without being paid. ∎ a person who freely enrolls for military service rather than being conscripted, esp. a member of a force formed by voluntary enrollment and distinct from the regular army. ∎ a plant that has not been deliberately planted. ∎ Law a person to whom a voluntary conveyance or deposition is made.• v. [intr.] freely offer to do something: he volunteered for the job| I rashly volunteered to be a contestant. ∎ [tr.] offer (help) in such a way: he volunteered his services as a driver for the convoy. ∎ say or suggest something without being asked: [tr.] it never paid to volunteer information | [with direct speech] “Her name's Louise,” Christina volunteered. ∎ work for an organization without being paid. ∎ [tr.] commit (someone) to a particular undertaking, typically without consulting them: he was volunteered for parachute training by friends.