上夜 Traditional form: 上夜 Pinyin (reading): shàngyè Definitions: to be on night duty Characters: 上 - above, on top, superior; to go up; to attend; previous 夜 - night, dark; under cover of night Traditional characters: 上 - above, on top, superior; to go up; to attend; previous 夜 - night, dark; under cover of night