| Babe in the woods | A babe in the woods is a naive defenseless person |
| Back foot | basically means you are at a disadvantage and forced to be defensive of your position |
| Back number | Something that is back number is dated or out of fashion |
| Back the wrong house | giving support to the losing side in something |
| Back to square one | you have to start from the beginning again |
| Back to the drawing board | you have to g back to the beginning and start again |
| Back to the salt mine | means returning back to work |
| Back to the wall | you are in a difficult situation and there is very little room for maneuver |
| Bad apple | a person who makes other people bad |
| Bad blood | holding grudges because of something that happened in the past |
| Bad egg | a person who cannot be trusted |
| Bad taste in your mouth | a feeling that there is something wrong or bad about something |
| Bad mouth | saying negative things about something or someone |
| Bag of bones | underweight |
| Bag of nerves | worried or nervous |
