Don't stand so near the edge! You're frightening me.
She was frightened by the anger in his eyes.
Computers used to frighten me, but not now.
frighten somebody to death/frighten the life out of somebody (=make someone feel extremely afraid)
He drove at a speed which frightened Lara to death.
frighten somebody ↔ awayphrasal verb
Terrorist activity in the area has frightened most tourists away.
frighten somebody into somethingphrasal verb
frighten somebody into doing something
He frightened me into staying silent.
frighten somebody/something ↔ offphrasal verb
The investors were frightened off by the company's low profits that year.