turn someone off

turn off

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.
See also: off, turn
Farlex Dictionary of Idioms.

turn someone off

tv. to dull someone’s interest in someone or something. The preacher set out to turn off the congregation to sin.
See also: off, someone, turn
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • blow off
  • blow someone/something off
  • base off (of) (something else)
  • check off
  • bite off
  • blow off the map
  • cast off
  • call off
  • brass off
  • brassed off
References in periodicals archive
Lord Neuberger, president of the Supreme Court, said spending a couple of months in prison would not turn someone off crime.
Senior judge: Prison is bad for criminals
And there's nothing more likely to turn someone off the subject than if he or she is constantly told 'how can you fall in love with that?' Whether Sea The Stars is 'better' than the likes of Ribot and Sea-Bird is irrelevant, save for the odd private daydream.
Television to blame for age of distorted reputation
This allows you to avoid using terminology that is too difficult, which is the quickest way to turn someone off from reading and using something like this."
Writing SOPs Everyone Can Use
Be careful, too much prodding may turn someone off.
Testing on the 'Net