The LITERAL meaning is that a light has been extinguished and it is dark.
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.
You don't need a list. The literal meaning is whatever the phrase sounds like. For example, the literal meaning of "raining cats and dogs" would be dogs and cats falling out of the clouds.
No, an idiom is not the same as an oxymoron. An idiom is a phrase that has a figurative meaning different from its literal meaning, while an oxymoron is a figure of speech that combines contradictory terms, like "jumbo shrimp" or "deafening silence."
Yes, because the literal meaning makes no sense. A person cannot really chime like a bell. This idiom means that the person speaks up, or adds their comments to the conversation.
No, "haven eaten five bags of crisps" is not an idiom. An idiom is a phrase or expression whose meaning is not easily deduced from the individual words, like "kick the bucket" meaning to die. The phrase you mentioned is a literal statement about consuming crisps and does not convey a figurative meaning.
It means to have a group of pople or animals die very rapidly. This can be literal dying or figurative, as in "the contestants in the contest are dropping like flies."
Yes idioms are somesort of figure of speech. Something like "In a jam" would be one of those.
idiom is like discribe e.g as light as a feather
No. This is not an idiom. An idiom is a group of words whose meaning is different from the meanings of the individual words. So it is not easy to know the meaning of an idiom. For example 'Let the cat out of the bag' is an idiom meaning to tell a secret by mistake. The meaning has nothing to do with cats or bags. "Treat others like you would want them to treat you" is a saying,
That is not an idiom. When you see the word LIKE, you're looking at a simile.
working like a dog
The term 'like' have the same meaning with its literal meaning.