It means to not go out of your way to become estranged from others. You just might need them later. It is about like a literal bridge. It is okay to burn one if you never have to cross back over. However, if there is a chance you will need to cross back over, you should never burn it, since building a new one will be much harder. Relationships are quite similar. You can turn others against you to make them leave you alone, or you can act like you are better than others. However, there may come a time when you need their help.
you had it with someone, you dont want to do something no more
Dont let it bother you. forget it.
The term 'crash and burn' is a colloquial idiom that means to fail suddenly and completely. The phrase possibly originated from losing an aerial dog-fight.
This isn't an idiom because you can figure out what it means pretty easily. It's an exaggeration - pretending that your money is so eager to leave your pocket that it can burn a hole to get out.
It is not an idiom, it means your nose is itching.
It's not really an idiom. It means "what are you thinking about."
RFP is not an idiom. It's an abbreviation.
"Sieve" is not an idiom. See the related link.
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book
can you clarify what you mean by "rugby bridges"
This is not an idiom. It is a measurement. $100,000 is how you write it in numbers.