| Idiom | Meaning | Example |
| backside |
buttocks, bum, buns
|
When I was learning to skate, I fell a lot. My backside was sore!
|
| backup |
saving information on a computer disk
|
Don't forget to make a backup disk of all your computer files.
|
| bad apple |
bad one, rotten one
|
He's the bad apple in that group. He's always in trouble.
|
| bad blood |
bad feelings, a negative relationship
|
John and Fred are bitter enemies. There's bad blood between them.
|
| bad breath |
unpleasant smell from the mouth, jungle mouth
|
I've been eating garlic, so I may have bad breath.
|
| bad date |
a man who beats a prostitute, the john
|
Viki had another bad date. A guy beat her and took her clothes.
|
| bad news |
troublemaker, someone who causes problems
|
Don't hire him. Everybody says he's bad news.
|
| bad taste in my mouth |
(See a bad taste in my mouth)
|
|
| badmouth |
criticize, say bad things about, put down
|
Don't badmouth employers. Don't criticize your references.
|
| bafflegab |
confusing statements, jargon, political language
|
There was a lot of bafflegab in the speech, a lot of nonsense.
|