Feel a bit under the weather
feeling slightly sick
Let the cat out of the bag
To share information that was a secret
At the drop of a hat
do something instantly without hesitation
Once in a blue moon
rarely happens
It goes in one ear and out the other?
Forget immediately
Biting off more than you can chew
Taking on a task that is too much to handle
Giving someone the cold shoulder
Ignoring someone
The whole nine yards
includes everything it possibly can
Cutting Corners
Not performing a task correctly in order to have time/money
Don't count your chickens before they hatch
Don't count on something happening until after its already happened
It takes two to tango
action that needs more than one person
Getting a taste of your own medicine
Being treated how you have been treating others
He is on the ball
He understands the situation/topic well
Take with a grain of salt
Don't take it too seriously
Steal someone's thunder
Take credit for something they did and not you
He has bigger fish to fry
He has more important things to take care
Fit as a fiddle
Being in good health
You can't judge a book by its cover
Can not judge something based on its appearance
Ball is in your court
It is up to you to make the next decision/step
Beat around the bush
Avoid sharing you true feeling to avoid hurting feelings
The ring cost an arm and a leg
It is very expensive
I can't seem to wrap my head around it
Having trouble understanding
Best thing since sliced bread
a good idea, invention or plan
A dime a donzen
Something that is very common, not unique