volunteer -- (tell voluntarily; "He volunteered the information")
volunteer, offer -- (agree freely; "She volunteered to drive the old lady home"; "I offered to help with the dishes but the hostess would not hear of it")
volunteer -- (do volunteer work)
Overview of adj volunteer
The adj volunteer has 1 sense
unpaid, volunteer -- (without payment; "the soup kitchen was run primarily by unpaid helpers"; "a volunteer fire department")