back sb up	support sb morrally
back out of sth	try to avoid doing sth when you promised to do it
back on to	overlooks it from the back windows
back away from	shrink back in fear from
back down	apologise
be around	be still in the same place and be able to be contacted
be out to	be aiming very seriously to do sth
be through with	want no more to do with sth or sb
be off	leave be cancelled finish work go bad of meat butter
be up to sth/no good	be doing sth mischievous or dishonest
be behind with (one's work)	allowed more and more work to accumulate
be in for	be going to get sth unpleasant
be on	take place of concerts exhibitions etc
be over at (a friend's house)	be on a visit to a friend's house
be behind it all	be really responsible for it
be on to sb about sth	be continually criticising sb about sth
be well up on sth	know a lot about sth
break up	begin school holiday a fight-interrupt and stop it disintegrate a car-knock it into pieces of weathe
the outbreak	beginning of sth bad like wars epidemics
break oneself of a habit	force oneself to give it up
break with sb	stop having anything to do with sb
break with tradition	do sth quite different or new
break the news to sb	tell sb some bad news as gently as possible
break the back of sth	have done most of it and all the hardest part
break through	appeared through the clouds - sun
a break-through	major discovery in research etc
a lucky break	stroke of luck generally for a criminal
drive at breakneck speed	drive dangerously fast
bring up a child	teach it manners, speech ect
upbringing	education by parents
bring up a subject	raise it start talking about it
bring up sb's food	be sick vomit
bring sth about	cause sth to happen
bring sth on	cause sth to happen generally used of illnesses
bring sb round	invite sb to accompany you on a visit, help sb recover consciousness after fainting
bring sb round to one's way of thinking	persuade sb to accept the rightness of yr ideas
bring sb through an illness	cure sb of an illness