lead someone by the nose 表示（非正式）（尤指用欺骗手段）“牵着某人的鼻子走；任意操控某人”。

【例句】
I'm surprised that Robert lets his girlfriend lead him by the nose like that.
我真的很讶异 Robert 让他女朋友这样牵着鼻子走。

My grandfather thinks he’s the boss, but everyone knows that grandma really leads him by the nose.
我祖父认为他说话算数，但其实大家都知道他什么都听祖母的。