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.
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.
If you are "carrying a torch" for someone, it means that you fancy them.