{adj. phr.}, {informal} Not liked by someone; not friendly with a person. * /Sally's boyfriend got on Father's bad side by keeping Sally out too late after the dance./ Contrast: ON ONE'S GOOD SIDE.
ON THE BAD SIDE OF ONE
Meaning of ON THE BAD SIDE OF ONE in English
Slang English vocab. Английский сленговый словарь. 2012