Usually the phrase is "Won by a nose", referring to horse races. The winner in a horse race is determined by which horse gets part of the body over the finish line first (which will almost always be his nose). When a race is so close that the lead horse is only ahead by a few inches, this is called "winning by a nose" because the lead horse was about a horses-nose-length ahead of the second horse. This is also where we get "photo finish", where the still-frame photograph was necessary to know which nose actually crossed the finish line first.
This idiom comes from horse racing. You'd bet on whichever horse's nose would come in first. If you make a good guess, you're "on the nose."
Nose bleeds are caused by a rupture of the capillaries in the nose (by irritation or in some unfortunate people excitement/exercise). If you are not bleeding that doesn't mean you are not doing damage. By picking your nose, you make yourself more likely to get colds & viruses.
Plastic surgery or you can make the appearance of a slimmer nose with make-up. But a symmetrical nose is not in anyway necessarily a more attractive nose.
Type your answer here... how to make my nose slimmer
A nose piercing can make your nose stand out.
She has an itchy nose.
no
The nose is die Nase in German.
That he thinks you have a cute nose.
The holes at the end of your nose flare if you make the holes bigger. It can be more easily seen on a horse.
la nez mean nose
It is not an idiom, it means your nose is itching.