Crocodile tears
Fake crying or not really upset
Needle in a haystack
Look for something almost impossible to find
Raining cats and dogs
Raining very hard
Costs an arm and a leg
Very expensive
Wolf in sheep's clothing
A trickster
Break the ice
Relieve the tension
On cloud nine
Very happy
Two peas in a pod
Just alike or the same
Smart cookie
Very smart or wise
Let the cat out of the bag
Reveal a secret
Clam up
Stop talking
Cutting corners
Ignoring rules or taking the easy way out
Hit the sack
Go to bed
When pigs fly
Never happening
Kill two birds with one stone
Achieve two things at once
Add fuel to the fire
Making something worse
The apple of my eye
Someone's favorite
Butterflies in my stomach
Very nervous or anxious
Time flies
Goes by quickly
Spill the beans
Reveal a secret
Piece of cake
Easy to do