be fed up with - be out of patience with
be on one’s own - live independently
be on the safe side - take no chances
be out of something - have no longer in supply
be tired of - be bored with ,frustrated with
be up to ones’ears - be extremely busy
be up to someone -be a person’s responsibility
be out for -trying to get
be out of the question - be unacceptable ,impossible
bite off more than one can chew - take on more than one can handle
break down - cease to function
break the ice - begin to be friendly wuth people one doesn’t know
break the news - inform or give bad news
brush up on - imporve noe’s knowledge of something through study
bump into - meet unexpectedly
by and large - in general
by heart - by memory
by all means - absolutely ,definitely
by no means - in no way