turn·off 
(tûrnôf′, -ŏf′)
(tûrnôf′, -ŏf′)n.
1. A branch of a road or path leading away from a main thoroughfare, especially an exit on a highway.
2. The act or an instance of turning off.
3. Slang
a. One that is distasteful: The evening was a real turnoff.
b. Something that causes loss of interest.