decriminalize       
verb [ T ] (UK usually decriminalise) uk/ˌdiːˈkrɪm.ɪ.nəl.aɪz/ us/ˌdiːˈkrɪm.ə.nəl.aɪz/
 使合法化
to stop something from being illegal
  the campaign to decriminalize marijuana 大麻合法化运动 
 Synonym: legalize
Opposites: criminalizeoutlaw 
Compare: legitimate verblegitimize