We found one dictionary that defines the word be on sb's back:

General (1 matching dictionary)

1. be on sb's back: Cambridge Advanced Learner's Dictionary

▸ Words similar to be on sb's back ▸ Usage examples for be on sb's back ▸ Idioms related to be on sb's back ▸ Wikipedia articles (New!) ▸ Words that often appear near be on sb's back ▸ Rhymes of be on sb's back ▸ Invented words related to be on sb's back