1. To render one stunned, insensible, or unconscious, as from a physical blow or the effects of a drug. I could hear him bad-mouthing my girlfriend, so I went over and rang his bells with a single left hook to the eye. Be careful with this stuff—it will really ring your bells if you take too much at once.

2. To be keenly attractive, interesting, or exciting to one. A lot of my friends are obsessed with going out and playing basketball or soccer, but reading a good novel is what rings my bells. If I'm honest, he isn't the type of man who would normally ring my bells, but he was so affable and funny that I felt attracted to him nonetheless.