It's not an idiom because you can figure out the meaning if you think - if you're running around in circles, you're not getting anywhere. It's a metaphor for fruitless work.
If you are exhausted but keep going anyway, you are running on empty.
The idiom 'sands of time' refers to the inexorable forward movement of time. It refers directly to the sand running through an hourglass.
"To be" is not an idiom - it's a verb.
Pest is not an idiom. It's a word.
The idiom "apple shiner" means the teacher's pet.
If you are exhausted but keep going anyway, you are running on empty.
The idiom 'sands of time' refers to the inexorable forward movement of time. It refers directly to the sand running through an hourglass.
"To be" is not an idiom - it's a verb.
If you've ever watched a dog chase its tail you have noted that it expends a lot of energy running around in circles without achieving a worthwhile objective. What is the dog going to do after it catches its tail? It means that you are wasting your time and effort in a useless pursuit.
No, "take a jump at the running donut" is not a recognized idiom in English. It seems to be a nonsensical phrase without a clear meaning or established usage. Idioms typically have figurative meanings that are widely understood, whereas this phrase does not fit that criteria.
Pest is not an idiom. It's a word.
The idiom "apple shiner" means the teacher's pet.
No, the idiom is "turned a blind eye" as in "she turned a blind eye to his suffering." You don't change an idiom around or you lose the meaning.
The meaning of the idiom in the pink of health means being in good health.
An idiom is a phrase that makes no sense unless you know the definition. Can a nose actually run somewhere? No, so this is an idiom.
The idiom means impress someone is egg on
It's not an idiom - to cope means to deal with, or to handle