Phrasal verbs na "B" :-)

back down
back off
back out
back up
bear out
bite back
bite into
bite off
blow away
blow down
blow off
blow out
blow over
blow up
boil down
border on
botch up
break away
break down
break for
break in
break into
break off
break out
break through
break up
break with
bring about
bring along
bring back
bring before
bring down
bring forward
bring in
bring on
bring out
bring round
bring together
bring up
brush aside
brush away
brush down
brush off
brush up
bugger about
bugger around
bugger off
bugger up
burn down
burn off
burn out
burn up
butt in