"Scared stiff"
Very scared, ex: When she saw the lion outside of its cage she was scared stiff.
"Over my dead body"
Something that will never happen because we refuse, ex: My child asked me if she could drive my car and I said "over my dead body"
"Cold blooded"
Evil, ex: it was a cold blooded crime
"Witch hunt"
Looking for somebody to punish them, ex: The neighbors were on a witch hunt for vandals... only to discover it was raccoons.
"A ghost town"
A place that is abandoned or empty, ex: the mall was a ghost town when I finished my work there at midnight.
" You' re digging your own grave"
Do something that causes you harm which is serious, ex: She dug her own grave when she made fun of the teacher.
"Smell a rat"
To think someone is dishonest to you, ex: The mobster in the movie said "I smell a rat" after the police busted them.
"Night owl"
Someone who likes staying up late at night, ex: My husband is a night owl and often stays up past midnight.
"Pale as a ghost"
Looking very white, someone lost colour, ex: I looked pale as a ghost when I caught the flu.
"Out of my mind"
The feeling of going "crazy", ex: 'm going out of my mind with all the papers I need to grade.
"Scaredy cat"
Very timid and scared easily, ex: My sister is a scaredy cat when it comes to haunted houses.
"Come back to haunt you"
Something that gets back to you as a problem or challenge, ex: All that homework I didn't turn in came back to haunt me when report cards came out.
"Makes my blood boil"
Something that makes you very angry, ex: bullies make my blood boil.
"Dead tired"
Exhausted, very tired, ex: All of my teachers look dead tired.
"Like a bat out of hell"
Moving extremely quickly, ex: Scared, he ran out of the house like a bat out of hell.
"Stabbed in the back"
Betrayed by someone, ex: She stabbed me in the back when she told everyone my secret.
"Skeleton in the closet"
A secret or something to hide, ex: Jim has a skeleton in his closet.
"You're a monster"
Someone who is out of control and behaves very badly, ex: When the kids were running around screaming, their mum said "they are monsters today".