Meaning of “frighten” - Learner’s Dictionary

frighten

verb [ T ] uk us /ˈfraɪtən/

B2 to make someone afraid or nervous:

It frightens me when he drives so fast.
→ See also scare/frighten the (living) daylights out of sb , scare/frighten sb out of their wits

(Definition of “frighten” from the Cambridge Learner’s Dictionary © Cambridge University Press)