Put the frighteners on (someone) phrasal verb negative spoken language
If you "put the frighteners on someone", you frighten or threaten them.
They put the frighteners on the witness to ask him not to tell the truth.
The bullies put the frighteners on him by breaking the stuff in his house.
The bank has put the frighteners on those whose mortgages are in arrears by sending them warning letters.
His parents try to put the frighteners on him to make him study harder.
I'm not stupid or easily scared.
To threaten someone.
Make someone extremely frightened
To be in serious trouble
To frighten or terrify someone abruptly or severely