"Stick a knife in it"
To finish it off, ex: I was doing my homework at the kitchen table, at 6:30 mom said "stick a knife in it".
"Makes my blood boil"
Something that makes you very angry, ex: Bullies make my blood boil.
"Over my dead body"
Something that will never happen, ex: The kid asked his dad if she could drive his car and he said "over my dead body".
"Drop dead gorgeous"
Extremely good looking, ex: The young protagonist of the film is both drop dead gorgeous and talented. I'm sure she has a bright future ahead.
"Devil's advocate"
A person who presents the opposite side to stir up further discussion, ex:
"Scared the pants off me"
To be really scared, ex: the clown in the haunted house really scared the pants off me.
"Witch hunt"
Looking for something that isn't real, ex: The neighbors were on a witch hunt for vandals... only to discover it was raccoons.
"Scared stiff"
Very scared, ex: When she saw the lion outside of its cage, she was scared stiff.
"A ghost town"
A place that is abandoned or empty, ex: The mall was a ghost town when I got off work at 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.
"Skeleton in the closet"
To have a secret that could ruin a person's reputation. ex: Jim has a skeleton in his closet and now he is afraid it might be revealed.
"Come back to haunt you"
Something that re-emerges 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 of my mind"
The feeling of going "crazy", ex:I'm going out of my mind with all the papers I need to grade.
"Dead tired"
Exhausted, very tired, ex: All of my classmates looked dead tired at the end of exam season.
"Out for blood"
Very competitive or determined, ex: The defending champs were out for blood this season.
"Cold blooded"
Cruel, without emotion or pity, ex: A cold blooded crime.
"Pale as a ghost"
Very white looking, lost color, ex: I looked pale as a ghost when I got my flu shot.
"Night owl"
Someone who likes staying up late at night, ex: My brother is a night owl and often stays up past midnight.
"Stabbed in the back"
Betrayed by someone usually close to you, ex: She stabbed me in the back when she told everyone my secret.
"Send shivers down your spine"
Getting a strong feeling of fear or unease, ex: The eerie sound of footsteps upstairs sent shivers down my spine.
"Dig one's own grave"
To do sth that causes you harm or problems in the future, ex: You dug your own grave when you made a joke about the teacher in front of the whole class.