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key worker

noun mainly British
  1. a social worker, mental health worker, or nursery nurse assigned to an individual case, patient, or child
  2. (in Britain) a worker in any of a number of public sector professions considered by the government to be essential to society, for example teachers, police officers, NHS health workers etc
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012