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English definition of “volunteer”

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volunteer

verb
 
 
/ˌvɒlənˈtɪər/
OFFER [I, T] to offer to do something without being asked or told to do it: [+ to do sth] Rob volunteered to look after the kids.Taking part and getting involvedGetting involved for one's own benefit or against others' will
ARMY [I] to join the army, navy, etc without being officially told to join: In 1939 he volunteered for active service.Joining or leaving the army
INFORMATION [T] to give information without being asked: No one volunteered the truth.Announcing, informing and stating
(Definition of volunteer verb from the Cambridge Learners Dictionary © Cambridge University Press)
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