Something that has fallen through can mean several things. One thing is that the thing has slipped through a crack or opening and fallen. Another meaning is that something which was supposed to occur has not.
Some examples of each meaning:
It's not an idiom because you can figure out the meaning by context - you are willing to go through dangers or hardship for something or someone.
"To be" is not an idiom - it's a verb.
If something has fallen off, it might mean one of several things. It could mean that an object has slipped off the surface it was sitting on, and fallen. It could also mean that something has decreased.Examples of both meanings:The vase has fallen off the shelf and broken.Business has fallen off since that new store opened.
The idiom 'sands of time' refers to the inexorable forward movement of time. It refers directly to the sand running through an hourglass.
Pest is not an idiom. It's a word.
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.
As ___ as ___ is not an idiom. Remember - AS = A Simile!The proper simile would be "as quiet as a mouse" or "as quiet as new-fallen snow."
The idiom "apple shiner" means the teacher's pet.
The meaning of the idiom in the pink of health means being in good health.
The idiom means impress someone is egg on
It's not an idiom - to cope means to deal with, or to handle
"Old hand" is an idiom meaning having lots of experience.