They are enamored or in awe of a person. They feel that the ground they have walked on is now special simply by the touch of their feet.
If you have your ear to the ground, then you are listening to gossip or rumors, and you know all of the latest "dirt."
The idiom you have alluded to means to be placed precariously or unfavourably in a situation. The American expression "skating on thin ice" has a meaning that is synonymous and can be used interchangeably with the idiom in question.
Can you figure out the meaning by defining the terms literally? No, so it is an idiom. Literally, it means to remove something, but figuratively it means for an airplane to get off the ground.
That is an idiom (an expression or saying particular to a region that has a figurative meaning).
"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.