Food idioms
Action-based idioms
Animal idioms
Body-part idioms
Money idioms
100

Something very easy to do

Piece of cake 

100

To start a conversation or make people feel more comfortable

Break the ice

100

To solve two problems with one action

Kill two birds with one stone

100

To be very expensive

Cost an arm and a leg

100

To be extremely expensive or spend all of one’s money in one shot

Break the bank

200

To try to do more than you can manage.

Bite off more than you can chew

200

To do something in the easiest or cheapest way, often badly

Cut corners

200

To reveal a secret by mistake

Let the cat out of the bag

200

A way of wishing someone good luck, especially before a performance

Break a leg

200

Time is a valuable resource. Used to emphasize that time is not a free commodity

Time is money

300

To be upset about something that has already happened and can’t be changed.

Cry over spilled milk

300

To describe something exactly right

Hit the nail on the head

300

A problem that everyone is avoiding discussing

The elephant in the room

300

To catch someone while they are doing something wrong

Catch someone red-handed

300

A phrase that means someone either looks really good or is in a good mood

Looks/feels like a million bucks

400

To be very similar or close

Like two peas in a pod

400

To avoid talking about what’s important

Beat around the bush

400

Don’t count on something good to happen until it’s actually happened

Don’t count your chickens before they hatch

400

Deeply in love

Head over heels

400

Used to remind someone that money is limited and shouldn’t be spent carelessly

Money doesn’t grow on trees

500

To not completely believe something

Take with a pinch of salt

500

To do something difficult or unpleasant that you have been avoiding

Bite the bullet

500

Information from the person who knows best

Straight from the horse’s mouth

500

Promise to keep a secret

(my) lips are sealed

500

When something costs very little money 

Dirt cheap