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1. have something on. See have nothing on, def. 3.
2. have someone on; put someone on. Deceive or fool someone, as in There was no answer when I called; someone must be having me on, or You can't mean you're taking up ballet-you're putting me on! [Colloquial; mid-1800s]
1. To be wearing something: The dancers had on red shoes. The snowman had a scarf on.
2. To carry something on one's person: Do you have a toothpick on you?
3. To have something scheduled: We have a dinner party on for Friday. Do you have anything on for next weekend?
4. To possess information, usually damaging, about someone or something: Don't worry—the investigators have nothing on you. Anything they have on us won't hold up in court.
5. To tease or mislead by suggesting something is true: Did you really have dinner with the president, or are you just having me on?