B

 Bring up  — To mention something

Mark was sick and had to miss the party, so please don’t bring it up, I don’t want him to feel bad for missing it.

Bring on  — To cause something to happen, usually something negative

His lung cancer was brought on by years of smoking.

Bring it on!  — To accept a challenge with confidence

          You want to have a race? Bring it on! I can beat you!

back up :to support or encourage

                  The new evidence backs up my arguments.

be carried away :to be so excited about something that you do not control what you say or do

               There's far too much food - I'm afraid I got a bit carried away.

blow up : start

                  If a storm or an argument blows up, it starts suddenly.

break down :If a machine or vehicle breaks down, it stops working.

                     My car broke down on the way to work.

break in: to get into a building or car using force, usually to steal something