be on someone's back

US /bi ɑn ˈsʌm.wʌnz bæk/
UK /bi ɑn ˈsʌm.wʌnz bæk/
"be on someone's back" picture
1.

to constantly criticize or nag someone

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My boss is always on my back about deadlines.
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She hates it when her parents are on her back about her grades.
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pat someone on the backsomeone's back is turnedbehind someone's backstab someone in the backcover someone's backthe shirt off someone's backget off someone's back