"Darting" means moving rapidly from one place to another. If your eyes "dart," then your gaze is rapidly shifting from one point to the other.
"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.
The meaning of the idiom in the pink of health means being in good health.
The idiom means impress someone is egg on
I've never heard that expression used idiomatically, but if it is, it is obviously referring to paying too much attention to what's behind you (including past experiences) when you should be giving your full attention to what's in front of you. It doesn't seem to be an idiom. I think it's just a figure of speech to make the writing more dramatic -- the person's eyes are "darting," meaning they move rapidly back and forth from the road in front to the rear-view mirror of the car, or to the rear-view behind them.
It's not an idiom, it's a description. Go look in a mirror and close your mouth and you'll see what it means. It's someone who isn't talking.
"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.
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.
It is not an idiom. It is an expression. The difference is that an idiom's meaning cannot be derived from the meaning of its individual words. In the expression wolfing down food, the meaning is clearly derived from the meaning of the words, and people have been saying it for hundreds of years.
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,
Teasing you .