It's a piece of cake
It's easy
Hit the sack
Go to sleep
Hang in there
Don't give up
Spill the beans
Give away a secret
It's raining cats and dogs
It's raining hard
Look before you leap
think carefully before making a decision
cost an arm and a leg
very expensive
There are other fish in the sea
It's OK to miss this opportunity. Others will arise.
Give someone the cold shoulder
Ignore someone
A penny for your thoughts
Tell me what you're thinking
Pull someone's leg
tricking someone for fun
Once in a blue moon
Rarely
Take a rain check
Postpone a plan
Actions speak louder than words
What you do means more than what you say.
Saving for a rainy day
Saving for later
call it a day
stop working on something
Cut somebody some slack
Don't be so critical
A blessing in disguise
a good thing that seemed bad at first
Under the weather
feeling sick
Take it with a grain of salt
Don’t take it too seriously
Pull yourself together
Calm down
It's not rocket science
It's not complicated
On the ball
Doing a good job
The ball is in your court
It's your decision
Miss the boat
It's too late
A dime a dozen
Something very common
The best thing since sliced bread
A really good invention
Wrap your head around something
To understand something
You can't judge a book by its cover
This person or thing may look bad, but it's good inside
hold your horses
wait a moment
Let the cat out of the bag
Give away a secret