From the verb phrase turn off.
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- (idiomatic) Something that repulses, disgusts, or discourages, especially sexually.
- I like the people at my job, but the 60-hour work weeks are a big turn-off.
- Braces on a pretty girl actually aren't a turn-off for me.
- Synonym: passion killer
- A road where one turns off, such as a motorway exit.