Idioms

A bad apple
Be a piece of cake
Be all ears
Be the apple of someone's eye
Be as American as apple pie
Be as blind as a bat.

Backfire
Bark up the wrong tree
Beat around the bush
Beat it
Bend over backward/backwards
Bite off more than one can chew
Bookworm
The bottom line
Bring the house down
Be broke
Bug someone
Butterflies in someone's stomach

Can't make head nor tail (out) of something / someone
Cast pearls before swine
Catch someone's eye
Be chicken
Cold feet
Cold turkey
Cook someone's goose
Be (as) cool as a cucumber
Cool someone's heels
Couch potato
Be cut from the same cloth

Dear John letter
Don't let the grass grow under your feet.
Be down in the dumps
Drive someone up the wall

Eat out
Easy as pie
Eat one's words

Fall in love with someone/something
Feel like a fish out of water
Be fishy
Food for thought
A frog in someone's throat

Get over something
Get up (Wake up) on the wrong side of the bed
Give someone a hand
Be glued to something
Go nuts
Grab a bite
Great minds think alike.

A hand-me-down
Hat trick
Here you go / are
(Somebody's) heart sinks
Hit the books
Hit the ceiling / roof
Hit the nail on the head
Hold one's horses
Hit the sack/hay
Holy Cow

Be in a pickle
Be in the same boat
It's easier said than done.
Be in hot water
It's about time

Keep an eye on someone/something
Keep one's bed
Kick the bucket
Kill time
Know by heart

The last/final straw
Let someone know
Be like taking candy from a baby
Be like the cat that got the cream
Low-key

Make ends meet
Feel / Look like a million dollars

Not hold water

Be on the tip of someone's tongue
Once in a blue moon
Out of the blue
Out of the frying pan and into the fire
Be over the hill

Pop the question
Play it by ear
Pop quiz
Pull someone's leg
Put all your eggs into one basket
Put yourself in someone's shoes

Race against the clock/time
Rain cats and dogs
Read between the lines
Rings a bell

See the light
Shake a leg
Be shaking like a leaf
So far so good
Be sold out
Speak of the devil
Stay up
Stuffed shirt
Surf the Internet/Net/Web

Take a leaf out of someone's book
Take it easy
Take to something like a duck to water
Tearjerker
That makes two of us.
That's that.
Throw in the towel
The tip of the iceberg
Time will tell.
Be tongue-tied
Top dog
Turn over a new leaf
Turn your back on (someone)
Twenty-four seven

Be under pressure
Be up and running
Be up in the air

Wear one's heart on one's sleeve
When it rains, it pours.
When pigs fly

You can say that again.