Food
A piece of cake
To kill 2 birds with 1 stone
Get 2 things done with a single action
Early bird catches the worm
Do something in a timely manner for success
Pick someone's brain
To get more information from someone in particular
A dime a dozen
Something common
Butter up
Being extra nice (usually selfishly)
It's raining cats and dogs
The lion's share
On the tip of my tongue
To almost remember something
Break a leg
Good luck
Have your cake and eat it too!
Wanting more than your fair share or need
Don't let the cat out of the bag
Don't reveal the secret
Pull a rabbit out of your hat
To surprise someone
Cost an arm and leg
Very expensive
Bite the bullet
To get something over with
Bring home the bacon
Earn an income
Wait, be patient
Sly as a fox
Off the top of my head
Hit the sack
Go to sleep
Apple of one's eye
to be adored by someone
Elephant in the room
An important topic or controversial issue
The straw that broke the camel's back
The last action or event that cannot be tolerated
To stick your neck out
To take a risk
Under the weather
Feeling sick