volunteer
verb/vu.lũ.tɐˈɾjaɾ/medium
vo·lun·ta·ri·ar
Definition
To offer oneself freely to do something; to make oneself available as a volunteer.
He decided to volunteer for the beach cleanup next Saturday.
Many citizens volunteered their cars to transport the injured.
Common collocations
volunteer to helpvolunteer for a missionvolunteer one's services
Etymology
De 'voluntário' + sufixo verbal '-ar'.