To doctor the accounts is to falsify the accounts.
No because you can figure out the meaning if you think about it. A PhD degree means you know a lot about a subject, so if you claim you're a "doctor of love," you're claiming you have earned a degree by knowing a lot about love.
love is irrational and stupid ;)
To say that there is no love lost between two people means that they dislike each 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
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.