| A | B |
| beggars can't be choosers | needy people shouldn't complain with what they get from others |
| better half | either partner in marriage |
| bells and whistles | impressive accessories |
| bed of roses | a wonderful, easy, comfortable situation |
| between a rock and a hard place | being in a tight spot with a difficult decision to make |
| birds of a feather flock together | people with things in common usually hang together |
| bite your tongue | struggle not to say something you want to say |
| bite the hand that feeds you | to turn against someone who helps you |
| black sheep of the family | least admirable or most unsuccessful member of the family or group |