hit the nail on the head
get something exactly right
under the weather
sick, not feeling well
take things in your own hands
take action yourself, don't rely on others
go back to the drawing board
start over completely
two birds with one stone
solve two problems with one action
get bent out of shape
get upset or angry
call it a day
stop doing something, finish
down for the count
to be unable to keep going
cut corners
do a bad job to save time or money
hold your horses
slow down, stop, wait
on the fence
undecided
hit the sack
go to bed
see red
very angry, enraged
all your eggs in one basket
depending too much on one thing
have bigger fish to fry
have more important things to do
burn bridges
destroy relationships
last straw
the limit, no more will be accepted/allowed
poker face
successfully hide your real emotions or ideas
spill the beans
to reveal a secret when you shouldn't
barking up the wrong tree
to be mistaken, thinking about something wrong, or looking for solutions/answers in the wrong place
like a ton of bricks
extremely shocking, surprising, or overwhelming
hook, line, and sinker
to be completely fooled or tricked
on pins and needles
nervous, anxious
a dime a dozen
common, nothing special
the elephant in the room
a major problem that no one is talking about