be on someone's back idiom informal
多次找（某人）的麻烦;多次批评（某人）
to criticize someone several times in an annoying way
She's on my back again about those sales figures - I just haven't had a moment to do them. 她又跟我唠叨要那些销售数据——我只是还抽不出时间来弄。
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