| Baker's dozen | its 13 rather than 12 |
| Ball is in your court | it is upto you to make the decision or take the next step |
| Ballpark figure | rough estimate or a guesstimate |
| Banana republic | used for small countries that are dependent on one resource or crop and are governed by corrupt elites |
| Baptism of fire | unpleasant experience which is also usually a learning experience |
| Bare your heart | telling someone private and personal feelings |
| Barefaced liar | someone who keeps lying even when they're exposed |
| Bark is worse than their bite | they may get angry or shout but dont take any action |
| Barking up the wrong tree | situation where you have completely misread the situation and are totally wrong |
| Barrack room lawyer | person who gives opinion on things they are not qualified to speak about |
| Barrel os laughs | someone who is always joking and funny |
| Basket case | something so bad that cannot be helped |
| Batten down the hatches | you prepare for the worst that could happen to you |
| Battle of nerves | neither side in a conflict or a dispute are willing to back down |
| Be all ears | eager to hear what someone has to say |
