1.
If you ~ or scare away a person or animal, you frighten them so that they go away.
...an alarm to ~ an attacker.
...the problem of scaring birds away from airport runways.
PHRASAL VERB: V P n (not pron), V n P
2.
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 ~ voters.
= put off
PHRASAL VERB: V n P, V P n (not pron)