Clothing idioms
Color Idioms
Crime idioms
Death idioms
Household idioms
100

Clothes make the man/woman

What someone wears matters

100

Wear rose-colored glasses

To refuse to see anything bad

100

 Blow the whistle

To inform on a criminal

100

Six feet under 

Dead and buried

100

A watched pot never boils

If you focus on something, it won't happen  

200

Mad as a hatter

A crazy person

200

Caught red-handed

To be caught in the act of a crime

200

Cook the books

 To deliberately change the numbers in a business to steal money

200

Kick the bucket 

To die

200

Called on the carpet

To be confronted about something you did

300

Fly by the seat of your pants

To do something with no plan

300

Once in a blue moon

Something that hardly ever happens

300

Cat burglar

 A very quiet and stealthy thief

300

Sleeping with the fishes

The victim of a mafia hit

300

Darken someone's door

 To show up where you're not wanted

400

Handle with kid goves

Be careful around this person

400

 Have a green thumb

To be good at gardening

400

 Pull a fast one

To cheat someone

400

 Dead as a doornail

Really and truly deceased

400

Lie like a rug 

To never tell the truth

500

Roll up your sleeves

Get right to work on something

500

Roll out the red carpet

To be extremely welcoming to someone

500

The big house

Prison

500

Buying the farm 

Dying

500

A wet blanket 

Someone who ruins the fun