Meaning of “frighten” - Learner’s Dictionary

frighten

verb [ T ] us uk /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

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