lit. to go beyond the sacrificial altar and take over the kitchen (idiom) / fig. to exceed one's place and meddle in other people's affairs / to take matters into one's own hands
折冲樽俎
zhé chōng zūn zǔ
lit. to stop the enemy at the banquet table / fig. to get the better of an enemy during diplomatic functions
人为刀俎,我为鱼肉
rén wéi dāo zǔ , wǒ wéi yú ròu
lit. to be the meat on sb's chopping block (idiom) / fig. to be at sb's mercy