It means useless.
The meaning of the idiom in the pink of health means being in good health.
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,
Nothing. To get off the hook, however, means to escape punishment.
Nothing. The correct idiom is "get OFF your high horse," meaning stop acting so conceited as if you are above everyone else.
This is not an idiom. It means exactly what it says. The company that this person keeps is not a good group of people.
"To be" is not an idiom - it's a verb.
"Loud of your mind" is not a common idiom. It likely stems from a misunderstanding or misuse of the idiom "out of your mind," which means to be crazy or irrational.
To feel A1 is to be in good health and happy with life.
to do nothing nothing to do
Pest is not an idiom. It's a word.
It means you did your best and were honorable; you didn't cheat or anything.
The idiom "apple shiner" means the teacher's pet.