Definition from macmillandictionary.com
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An accountant volunteered to help with the wildlife sanctuary’s accounts.
Thirty-two patients volunteered for the research study.
I volunteered my services as a school governor.
Claire volunteers at the homeless shelter once a week.
He didn’t ask me, and I didn’t volunteer any information.
Martha volunteered that they planned to adopt a child.
My mother has volunteered me to help with the school play.