It means to be very angry.
This is not an idiom. When you see AS ___ AS ___ you are looking at A Simile. This is comparing two flat things.
It depends on how you use it. If you mean literal colors, then it's not an idiom. If you say something like "It's all there in black and white," then it's an idiom meaning that something is printed.
When all eyes are something, then everyone is looking at it.
There aren't any idioms that mean "black" that I know of. There are plenty of similes, like "black as the ace of spades."
It means you are looking to move, to live somewhere else.
This is not an idiom. When you see AS ___ AS ___, you are looking at A Simile. This one is comparing something to the red color of a turkey's wattle.
This is not an idiom. It is comparing one thing to another, so it is a simile. Remember: "AS ___ AS___" means A Simile! It is just saying that something is very black.
In debt. Its antithesis, "in the black," refers to having a balanced budget.
Which border do you mean? If you are looking for the answer to the Times Jumbo Crossword 820 the answer is 'Scotticism'!
"A black day" is an idiom in contemporary English that is relatively uncommon but still quite useful. With "black" referring primarily to darkness (of night, of a storm, etc.) when there ought to be light, its basic meaning is simply this: "a bad or difficult day."
This is not an idiom. When you see a comparison with "Like a ___" you're looking at a simile. This one's comparing something to an old Model-T car.
This is not an idiom. First, it means exactly what it says. Second, when you see AS ___ AS ___ then you are looking at A Simile. Someone is comparing something that is soft to a soft cloud.