| A | B |
| break a leg | good luck |
| bring down the house | to get an audience to laugh or clap loudly |
| button your lip | to stop talking |
| butterflies in stomach | nrevous, fluttery feeling |
| by the skin of your teeth | just barely |
| burn the candle at both ends | overworking yourself to exhaustion |
| burn the midnight oil | stay up very late working |
| bug off | to stop annoying someone |
| bring home the bacon | to support a family by working |
| break the ice | to ease the nervousness in a situation |
| break wind | pass gas |