It means she always knows what your doing, where you are, who your with. Or she is annoying. Depends how it is said in a sentence.
say no to it
Picture someone holding their nose up in the air - they look very aloof and snobbish, right? That's what this idiom means.
Think about cutting off your nose - it would hurt like heck and be really ugly and you couldn't breathe well afterwards. This idiom refers to doing something that ends up being worse for you than it was for the person you were trying to punish by doing it.
It means things are trustworthy.
To make a mistake
About to be sold, or given up.
It means shut up!
flatter her to get something
To keep struggling and not give up.
he suddenly turned up (to appear, emarge)
maif you have a fan somewhere in your room and your nose gets dry,you get a bloody nose in the morning
That's not really an "idiom." Cats are animals. Cats lick themselves. In the process of licking themselves they often swallow a certain amount of fur. This hair gets balled up in their stomachs, and sometimes they'll cough (actually, it's more like "vomit") one back up. The product of this is a "cat's coughed up fur ball". Like I said ... not really an idiom.