verb
-ens; -ened; -ening
[+ obj] :to cause (someone) to become afraid
[no obj] :to become afraid
frighten away/off
[phrasal verb]
frighten (someone or something) away/off :to cause (someone or something) to go away or stay away because of fear
frighten into
[phrasal verb]
frighten (someone) into (doing something) :to cause (someone) to do (something) because of fear
frighten out of
[phrasal verb]
frighten (someone) out of (doing something) :to keep (someone) from (doing something) because of fear