[verb]To volunteer is 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.During the emergency many staff volunteered to work through the weekend. [+ to infinitive]I volunteered myself for the post of Health and Safety Representative. [T]He volunteered for the army (= He was not forced by law to join the army).To volunteer information is to give it without being asked.If I were you, I wouldn't volunteer any details of what happened. [T]"I saw her going out of the main entrance at about half past two," he volunteered. [+ speech]
VOLUNTEER
Meaning of VOLUNTEER in English
Cambridge English vocab. Кембриджский английский словарь. 2012