ACRONYM
IDIOMS
AMERICAN/BRITISH WORD
MATERIAL
USED FOR
100

BBS

Be back soon

100

It's a piece of cake.

Very easy

100

flat

apartment

100

sweater

wool

100

Vacuum cleaner

Clean the dust

200

BTW

By the way

200

It's raining cats and dogs. 

Rain hard

200

mobile phone

cell phone

200

fork

metal

200

Cooker

To cook food

300

LOL

Laughing out loud

300

Let the cat out of the bag.

Give away a secret

300

wardrobe

closet

300

Boots for rain

rubber

300

Compass

Navigation device to find direction

400

TTYL

Talk to you later

400

Break a leg.

Good luck

400

Chemist

drugstore

400

windows

glass

400

surveillance

electronic device to observe used by police

500

WTH

What the heck

500

Miss the boat.

It's too late.

500

pavement

sidewalk

500

wall

bricks

500

Cat's eye

reflective road stud