de·pop·u·late /(ˌ)diˈpɑpjəˌlet/
  (vt.)(vi.)(使)人口減少
  De·pop·u·late v. t. [imp. & p. p. Depopulated p. pr. & vb. n. Depopulating ]  To deprive of inhabitants, whether by death or by expulsion; to reduce greatly the populousness of; to dispeople; to unpeople.
  Where is this viper,
  That would depopulate the city?   --Shak.
  Note: ☞ It is not synonymous with laying waste or destroying, being limited to the loss of inhabitants; as, an army or a famine may depopulate a country. It rarely expresses an entire loss of inhabitants, but often a great diminution of their numbers; as, the deluge depopulated the earth.
  De·pop·u·late, v. i. To become dispeopled. [R.]
     Whether the country be depopulating or not.   --Goldsmith.
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  depopulate
       v : reduce in population; "The epidemic depopulated the
           countryside" [syn: desolate]