Its raining cats and dogs out there!
raining cats and dogs = raining really hard
My class was all smiles when I told them we were playing a game today.
all smiles= look very cheerful and happy, especially in comparison to a previous mood.
I was under the weather, so I didn't come to school.
under the weather= to feel sick
The test was a piece of cake.
piece of cake= really easy
I went for a walk to blow off steam.
blow off steam= to calm down or lower your emotions
Speak of the devil, Adam just walked in.
Speak of the devil= The person we were just talking about just showed up.
Are you pulling my leg?
Are you messing with me?
When you cut corners you might not get a good grade.
cut corners= do your job quickly/badly to save time
I said sorry to bury the hatchet.
bury the hatchet= make peace
My purse cost me an arm and a leg.
cost me an arm and a leg= extremely expensive
Lighten up, you're stressing too much.
Lighten up = relax a little.
If you play by the book, you will never lose.
play by the book= follow the rules
I was seeing red when I found that someone had eaten my lunch.
seeing red= to get really angry.
I'm tired, lets call it a day now.
call it a day= to decide to stop doing work
When he saw the teacher taking points, he started to butter her up.
butter her up= be extra nice to get what you want
It was hard for me to wrap my head around the ideas she was teaching.
wrap my head around = to fully understand something
You need to get a grip before you get in trouble for yelling.
get a grip= control your behavior
It was hard for me to keep a straight face when I was presenting in front of my friends.
keep a straight face= to try not to smile or laugh.
I told her about my hobbies to break the ice.
break the ice= to get introduced to others
It's time to hit the hay.
hit the hay= go to sleep
You're going to do great in the show, I hope you break a leg!
break a leg= Good luck
Those toys are a dime a dozen.
dime a dozen= something very common, easy to find
A picture is worth a thousand words.
Showing someone is better than telling them.
I don't like these ideas, lets go back to the drawing board.
go back to the drawing board= to start over
I wear my heart on my sleeve.
wear my heart on my sleeve= don't hide your feelings, especially your love for someone.