If your plans fall through, it means they did not work out.
People mean that it is the end of the world/
An idiom is a form of expression in a general group or culture. Something like 'It's raining buckets.' This doesn't mean there are literal buckets falling it just means it's raining hard. You most likely will have to define what each idiom means.
This is not an idiom. An idiom is an expression whose meaning cannot be deduced from its elements. To go through fire and water for someone is easily understood to mean to make a special effort and to undergo difficulties for that person's sake.
To seek a favor from someone through flattery
An idiom is a form of expression in a general group or culture. Something like 'It's raining buckets.' This doesn't mean there are literal buckets falling it just means it's raining hard. You most likely will have to define what each idiom means.
It's not an idiom because you can figure it out if you just think of the meaning of the words. It IS a metaphor, however, comparing the earth to something that moves. If you saw the earth "rushing up," then you'd be falling, wouldn't you?
If you slept through something, you did not wake up in time to attend it; you slept until after the event was over.
It means that someone was very sick, but they recovered after a long battle with illness.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
It is not an idiom, it means your nose is itching.
An idiom is a phrase that doesn't make sense until you know the definition. Can you actually fall into a hole called "love"? No, so this is an idiom.