From Longman Dictionary of Contemporary Englishsocial workerˈsocial ˌworker noun [countable] SSsomeone who is trained to help people who are poor, have family problems etc
Examples from the Corpus
social worker• A social worker is interpreting the proceedings for Mr Robson, a carpenter, who has speech difficulties.• In the role of therapist and social worker, I have seen many of those left behind assume the blame themselves.• His wife, a former social worker, gave up that line of work when she concluded it was hopeless.• The social worker tried to mediate without success in the available time. 