|Learning English - The Flatmates|
a black box
a small machine that records information about a plane during its flight, and which is used to find out the cause of an accident
The aircraft's black box has been found and will be analysed by experts.
a black market
illegal trading of goods that are not allowed to be bought and sold, or that there are not enough of for everyone who wants them
The tax on cigarettes is so high now that lots of people buy them on the black market.
black mark (informal, usually singular)
something you have done wrong or failed to do that affects how people think of you
If I don't hand my homework in on time, it will be another black mark against me.
not brave, cowardly
She's so yellow she wouldn't even look at the spider, let alone touch it.
a yellow card
a card shown to a player by the referee for a serious foul in a football match.
The ref gave her a yellow card for kicking another player.
a green card
a document that allows a foreigner to live and work in the United States
Although she's British, she's got a green card and can work in New York.
a green room
a room in, for example, a theatre or TV building where performers or guests can relax before and after their appearance on stage or on TV
After the show, the stars will relax with food and drink in the green room.
give the green light to something
give permission for someone to do something or for something to happen
We got given the green light for the project to start next month.
bright and strong
a sign, shape (or, a colour) which is used to represent something else
thin, usually square or rectangular piece of baked clay, plastic, or metal used for covering roofs