This is an idiom meaning to study. The image is of you cracking a book open. When you open a book and read, it's "cracking the books."
This is a metaphor, not an idiom. They are comparing that person to an angel, which is a supremely good being in religious lore.
"Break a leg" is theatrical slang for "good luck."
"Hit the books" is a sentence.
It's certainly not an idiom because you can figure out exactly what it means. It's telling you to start paying attention to the good things in your life.
Hit the Books: to prepare for classes by reading and doing all your assigned homework It means to study - you're "hitting" as in coming into contact with, or impacting, your books; you're opening them and reading.
It is not an idiom, it means your nose is itching.
RFP is not an idiom. It's an abbreviation.
It's not really an idiom. It means "what are you thinking about."
A good bet is something that would win, something that it would be a good idea to bet on, a sure thing.
"Sieve" is not an idiom. See the related link.
the origin of this idiom mean fail or succeed
It's not an idiom. It means the tip of your nostril.
The idiom your blood is boiling usually means that you are mad/furious.
Mind your Ps and Qs means to use good manners.
Dr.sues has many great books
The "good books" is a fictional book with the names of good people written in it. If you're in someone's good books, they're happy with you or impressed with you. If you're not in those books, they're unhappy with you. You've been dropped from the good books, so you've done something that's not good.
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.
this idiom is similar to "horsing around"- causing trouble
The idiom a slap on the wrist refers to a trivial punishment.
The idiom finger licking good means that something is extremely tasty.
It is in unison with time management. When you have good time management you can juggle your time well.
It means someone who is very good at things like gardening and growing things.
Simply its mean a bully.
many books do, pretty much any book has one.