1.
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.
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 scare off voters.
= put off
PHRASAL VERB : V n P , V P n (not pron)