I know something
piece of cake
easy
in a pickle
difficult situation
happy as a clam
very happy
spill the beans
tell a secret
frog in my throat
can't speak clearly
It's raining cats and dogs
It's raining very hard
Don't breathe a word
keep a secret
bull in a china shop
clumsy
time flies
time passes quickly
under the weather
feeling sick
head over heels
completely in love
out of whack
broken / not working
on the double
hurry up
hold your horses
wait
kick the bucket
draw a blank
can't remember
pull yourself together
calm down
wipe the slate clean
start over
the bee's knees
very good, the best
bringing home the bacon
earning money, getting paid
A chip on your shoulder
holding a grudge
Bend an ear
listen or pay attention
put your cards on the table
be honest
barking up the wrong tree
following the wrong course of action/making a mistake
take a load off
have a seat