hand in your notice(to officially tell your company that you are leaving the job: He handed in his notice when he heard that he had got the new job. Larina)
job leaver(Of these, there were 611,000 (30%) who had ceased a job involuntarily (job losers) and 1.4 million people (70%) who had ceased a job voluntarily (job leavers) – Australian Bureau of StatisticsTamerlane)
