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Back to the drawing board
When something fails, it is time to start over
Actions speak louder than words
A person's intentions can be judged better by what they do rather than what they say.
Hot potato
speaking of a controversial issue
costs an arm and a leg
raining cats and dogs
raining hard
to hit the nail on the head
to do or say something exactly right
piece of cake
under the weather
when someone is feeling sick
The early bird catches the worm
someone who gets up early and works hard, is likely to find success
barking up the wrong tree
to look in the wrong place
ball is in your court
when it is up to you to make the next step or decision
burn bridges
destroy relationships
Penny for your thoughts
A way of asking what someone is thinking
miss the boat
to miss an opportunity
see eye to eye
to agree with someone or share an opinion
let the cat out of the bag
to share/expose a secret
As right as rain
perfect
best thing since sliced bread
a good invention, something that is considered excellent, new and inventive
calm before the storm
it is calm but something bad is coming
bite off more than you can chew
to take on a task that is too big to handle
once in a blue moon
something that happens rarely
hit the hay
to go to bed
burn the midnight oil
to work late into the night
can't judge a book by its cover
one should not judge primarily on appearances
fit as a fiddle
to be in good health