rake-off

rake-off
n (infml 口) share of profits or commission, esp from dishonest or illegal activity 利润的分成或回扣（尤指从不正当或非法活动中获取者）
    She got a rake-off of 5 per cent from the deal. 她从这笔交易中获得百分之五的回扣.

牛津英汉双解词典