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1. verb To disable, disconnect, or stop the function of something. A noun or pronoun can be used between "turn" and "off." I forgot to turn off my laptop, and now the battery is dead. Please turn the water off when you're done brushing your teeth.
2. verb To steer a vehicle or walk off of a particular path or route. You're going to turn off at the next exit. We turned off the main path and started hiking around the edge of the lake.
3. verb To cause someone to dislike, become averse to, or lose interest in something. A noun or pronoun can be used between "turn" and "off." Sometimes followed by "to (something)." I thought the subject would be interesting, but the professor's boring lectures really turned me off. I know that the accident really turned Janet off to driving on the highway.
4. verb To cause someone to lose sexual interest or excitement. A noun or pronoun can be used between "turn" and "off." Nothing turns me off like someone who is arrogant. I think he was turned off by her many tattoos. Sorry, knowing your roommates are home kind of turns me off.
5. noun Something that causes someone to lose sexual interest or excitement. As a noun, the phrase is usually hyphenated. It's a big turn-off when a guy just talks about himself.
n. something that repels someone. The movie was a turn-off. I couldn’t stand it.