If you scare off or scare away a person or animal, you frighten them so that they go away. an alarm to scare off an attacker. the problem of scaring birds away from airport runways
If you scare someone off, you accidentally make them unwilling to become involved with you. I don't think that revealing your past to your boyfriend scared him off The new Democratic Party is not likely to scare off voters. = put off
{f} scare away, deter, frighten away, expel; cause to become afraid, cause to lose courage