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1. To enable, connect, or start the function of something. In this usage, a noun or pronoun can be used between "turn" and "on." Would you turn on the water heater for me, please? I need to turn on the lights to see properly.
2. To suddenly attack, berate, or show hostility toward someone. I know he seems friendly, but he'll turn on you in an instant if you disagree with him. The dog turned on its owner, biting him in the leg.
3. To shift or direct the focus of something onto someone or something. In this usage, a noun or pronoun can be used between "turn" and "on." Then the reporter turned the camera on me and started asking me about my involvement. Can you turn the lights on lead actor, please?
4. To depend on or center around someone or something. In this usage, a name, noun, or pronoun can be used between "turn" and "on." Our entire plan turns on them accepting this offer. The plot of the books turns on two brothers during the civil war.
5. slang To increase someone's sexual interest or excitement. In this usage, a name, noun, or pronoun can be used between "turn" and "on." I know it's clichéd, but expensive cars and nice suits really turn me on. Nothing like a bit of mood lighting and good music to turn on a date!
1. mod. made alert to what is new and exciting. I want to hire someone who’s really turned on—a real comer. A young, turned on MBA would be just right.
2. mod. drug intoxicated. (Drugs.) Jerry’s turned on by noon—every day. The kid over there looks sort of turned on. Let’s go talk to him a bit.