Under the weather.
Feeling sick/ill.
Pretty penny.
Expensive,
Break a leg.
Cut corners.
Take shortcuts to get something faster.
Blessing in disguise.
Something that seems bad but is actually good.
Hang in there.
Stay strong in a difficult/tough situation.
Call it a day.
Stop doing something.
Stick to your guns.
Stay strong in your beliefs, especially when others disagree.
Leave no stone unturned.
Looking everywhere without missing a spot.
Problems or trouble.
Blue in the face.
Feeling exhausted because of anger or stress.
Make a long story short.
Say something in a simple or brief manner.
Speak of the devil.
Refers to a person who appears just as they're being mentioned.
Let the cat out of the bag.
Carelessly revealing a secret.
Elephant in the room.
A major problem or issue that people are trying not to talk about.
Let someone off the hook.
Deciding that someone isn't in trouble.
Burst your bubble.
Prove that someone's beliefs are not true.
Walk on eggshells.
Be very careful with actions or words.
Steal someone's thunder.
Direct attention from someone else/prevent someone else from gaining praise.
Bite the bullet.
Get something hard over with quickly.
Through thick and thin.
At all times - good or bad.
Beat around the bush.
Not saying something directly. Avoiding saying something.
Apple of my eye.
Someone you are very fond of or like.
Set the record straight.
Tell the truth/clarify/correct a misunderstanding.
Kill two birds with one stone.
Accomplish two things by doing one thing.