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.
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.
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.
Pest is not an idiom. It's a word.
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 idiom "apple shiner" means the teacher's pet.
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.
It's not an idiom - to cope means to deal with, or to handle
The idiom means impress someone is egg on
"Old hand" is an idiom meaning having lots of experience.