turnoff I. \ˈ ̷ ̷ˌ ̷ ̷\noun (-s) Etymology:turn off 1. a.: a turning off b.: a place where one turns off < a wrong turnoff > c.: a side road : branch d.: a ramp leading from an express highway or turnpike 2. a.: completed product (as from a loom) b.: number or weight of marketed livestock < average annual turnoff of fat bullocks — R.M.Bowman > II. noun : one that causes loss of interest or enthusiasm < the music was a turnoff >