"Stabbed in the back"
Betrayed by someone, ex: She stabbed me in the back when she told everyone my secret.
"Come back to haunt you"
Something that resurfaces as a problem or challenge, ex: All that homework I didn't turn in came back to haunt me when report cards came out.
"Out for blood"
Very competitive or determined, ex: The defending champs were out for blood this season.
"A ghost town"
A place that is abandoned or empty, ex: the mall was a ghost town when I got off work at midnight.
"Scaredy pants"
Scared easily, ex: My sister is a scaredy pants when it comes to haunted houses.
"Over my dead body"
Something that will never happen, ex: My student asked if she could drive my car and I said "over my dead body"
"Stop dead in their tracks"
To freeze or not move, ex: I stopped dead in my tracks when I walked outside for lunch and saw Billie Eilish came to our school.
"Out of my mind"
The feeling of going "crazy", ex:I'm going out of my mind with all the papers I need to grade.
"Makes my blood boil"
Something that makes you very angry, ex: bullies make my blood boil.
"Cold blooded"
Evil, ex: it was a cold blooded crime
"Makes my skin crawl"
Creeps you out or makes you uncomfortable, ex: It makes my skin crawl when people crunch ice cubes.
"Night owl"
Someone who likes staying up late at night, ex: My husband is a night owl and often stays up past midnight.
"Smell a rat"
To think someone is not honest or who they say they are, ex: The mobster in the movie said "I smell a rat" after the police busted them.