| Idiom | Meaning | Example | 
| bare your soul | 
tell the public about your private experiences
 | 
To write a good novel, you may have to bare your soul.
 | 
| barf | 
vomit, puke, hork, throw up
 | 
If I eat another hotdog, I'll barf. I'll be sick.
 | 
| bark is worse than his bite | 
he sounds angry but he is not; do not be afraid of him
 | 
Baxter sounds mad, but his bark is worse than his bite.
 | 
| bark up the wrong tree | 
look in the wrong place, do not expect it
 | 
If you expect money from him, you're barking up the wrong tree.
 | 
| barnburner | 
(See a barnburner)
 | 
 | 
| bash | 
a wild party, a party where people are drunk and noisy
 | 
"Did you go to Tina's party?" "Ya. It was a noisy bash."
 | 
| basket case | 
(See a basket case)
 | 
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| basta la musica | 
stop the music, do not play the music
 | 
"Basta la musica!" Papa shouted. "It's too loud!"
 | 
| bat a thousand | 
hit every time at bat, win every competition
 | 
I've had two interviews and two offers. I'm batting a thousand!
 | 
| bat an eye | 
flinch or blink, show a sign of guilt or shame
 | 
When they asked him about the crime, he didn't bat an eye. His expression didn't change.
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