two people are normally behaving well together, but once they have an argument, their attitude will become very bad; friends turning into enemies after a dispute
to describe the action of someone who exposes all their private matters / secrets for all to see and not caring whether other people actually want to know about it or not.
(adjective) to want more than what one can eat / take in; to be overly greedy; to bite off more than one can chew; ; literally "eyes bigger than your stomach"