| Idiom | Meaning | Example | 
| behind your back | 
where you cannot see, when you are not here
 | 
He says nice things to you, but criticizes you behind your back.
 | 
| being there | 
being where good things happen, being in the right place at the right time
 | 
Caleb seems to succeed by just being there. Good things happen to him wherever he is.
 | 
| believe my ears | 
(See can't believe my ears)
 | 
 | 
| believe my eyes | 
(See can't believe my eyes)
 | 
 | 
| bells and whistles | 
(See all the bells and whistles)
 | 
 | 
| belly up | 
not operating, bankrupt, tits up
 | 
Four car dealers went belly up during the recession.
 | 
| belly up to the bar | 
sit close to the bar, find a chair at the bar
 | 
Belly up to the bar, boys. I'd like to buy you a drink.
 | 
| bellyache | 
complain, whine
 | 
Don't bellyache about the referee. Just play your best.
 | 
| below the poverty line | 
not earning enough to survive, very poor, as poor as a church mouse
 | 
If husband and wife are earning minimum wage, they're living below the poverty line.
 | 
| belt you | 
hit you, punch you
 | 
I should belt you for saying that my sister looks like a dog.
 |