It's raining cats and dogs
"To be all smiles".
look very happy and pleased, especially in contrast to a previous mood.
to burst into tears
to suddenly start to cry
"Bare your soul".
to tell someone your secret thoughts and feelings.
She was as hard as nails.
She was tough.
Break a leg
Good Luck!
Don't spill the beans.
Don't tell my secret
I'll believe it "when pigs fly".
I believe that is not going to happen; I'll believe it when I see it.
We don't see eye to eye.
We don't agree.
That was the last straw. I'm not going to do this anymore.
That was the last bad thing to happen and now I'm not doing it again.
Lose your head
to lose control of your emotions; loose your calm (cool)
"Hang in there".
Don't give up; stay determined; continue with a task
to see red
to get really angry.
"Get a grip on yourself".
to get control over your emotions.
"Keep a Straight Face".
to try not to smile or laugh; to not let on what is happening
That was a piece of cake.
That was easy.
He was on "pins and needles" waiting for his grades.
He is worried about his grades.
I feel under the weather.
I don't feel good; I feel sick.
"Get your act together"
Work better; organize yourself; do what it takes to get something done
I have butterflies in my stomach.
I'm nervous.
Blow off steam or let off steam
to do or say something to get rid of strong emotions
Sleep like a log.
Sleep really good; sleep without being woken up by anything
That costs "an arm and a leg".
That costs a lot of money. That's expensive.
I'm going to hit the sack.
I'm going to bed and sleep.
It's not rocket science.
It's not hard or complicated;( Indicate that something is easy.)