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English definition of “volunteer”

volunteer

verb     /ˌvɒl.ənˈtɪər/ US  /ˌvɑː.lənˈtɪr/
C1 [I or T] to offer to do something that you do not have to do, often without having been asked to do it and/or without expecting payment: [+ to infinitive] During the emergency many staff volunteered to work through the weekend. I volunteered myself for the post of Health and Safety Representative. My mates volunteered me to do the talking. He volunteered for the army (= he joined even though he did not have to).Accepting and agreeingAccepting and agreeing reluctantlyApproving and approval [T] to give information without being asked: If I were you, I wouldn't volunteer any details of what happened. [+ speech] "I saw her going out of the main entrance at about half past two," he volunteered.Saying and utteringSaying again
(Definition of volunteer verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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