1 [intransitive and transitive] to offer to do something without expecting any reward, often something that other people do not want to do
2 [transitive] to tell someone something without being asked :
Michael volunteered the information before I had a chance to ask.
Michael volunteered the information before I had a chance to ask.3 [intransitive]PM to offer to join the army, navy, or airforce :
When war broke out, my father volunteered immediately.
When war broke out, my father volunteered immediately.4 [transitive] to say that someone else will do a job even though they may not want to do it

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