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Found one definition

1.                 From Japanese-English FreeDict Dictionary ver. 0.1:
                   
   
   
                   
                     
    [news2]  [nf35]  青信号 /(en)tʃˈaɪniːz(ja)lˈe̞tə (en)tʃˈaɪniːz(ja)lˈe̞tə (en)tʃˈaɪniːz(ja)lˈe̞tə/,  [news2]  [nf35] あおしんごう /ˌäo̞ɕiŋɡˈo̞ɯᵝ/
   (noun (common) (futsuumeishi))
   green light