depopulate - definition and synonyms

verb [transitive] 

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/diːˈpɒpjʊleɪt/
present tense
I/you/we/theydepopulate
he/she/itdepopulates
present participledepopulating
past tensedepopulated
past participledepopulated
  1. to cause an area to have far fewer people living in it than before