volunteer
A. -noun (generally) voluntario (m) / voluntaria (f)
B. -adjective [forces] voluntario, de voluntarios [helper] voluntario
C. -transitive verb
1. (=offer)
[+one'noun help, services] ofrecer
[+remark, suggestion] hacer
[+information] dar
2. (=put forward) *
·they volunteered him for the job
·le señalaron contra su voluntad para la tarea
D. -intransitive verb
(for a task) ofrecerse (for the army) alistarse como voluntario
·to volunteer for service overseas
·ofrecerse para servir en ultramar
·to volunteer to do something
·ofrecerse (voluntario) para hacer algo
·he wasn't forced to, he volunteered
·nadie le obligó a ello, se ofreció libremente