| Idiom | Meaning | Example | 
| a brick short | 
(See one brick short of a full load)
 | 
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| a budding genius | 
a child who appears to be very intelligent
 | 
The newspaper described Pam as "a budding genius" on the violin.
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| a bull in a china shop | 
a big, reckless person in a room full of fragile things; cramp your style
 | 
Imagine a 300-pound football player at a tea party, and you have a bull in a china shop.
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| a bum rap | 
unfair blame, unjust sentence, take the rap
 | 
It was a bum rap. Eddie didn't steal those paintings.
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| a bummer | 
an unfortunate event, bad luck, too bad
 | 
"Somebody broke a window in his car and stole his stereo." "That's a bummer."
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| a bun in the oven | 
pregnant, expecting a baby
 | 
Mabel has a bun in the oven. The baby's due in April.
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| a bunch of malarkey | 
an untrue story, a lot of bunk, bull
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"Do you believe what the psychic said about your future?" "No. It's a bunch of malarkey."
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| a bundle of nerves | 
a very nervous person; uptight person
 | 
May has so many problems - she's just a bundle of nerves.
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| a card | 
(See such a card)
 | 
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| a case of | 
an example of, it's a case of
 | 
Look at Bosnia. That's a case of ethnic civil war.
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