| Idiom | Meaning | Example | 
| age before beauty | 
the older person should be allowed to enter first
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"Age before beauty," she said as she opened the door for me.
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| age of majority | 
the age when you can vote, come of age
 | 
Dad said that when I reach the age of majority I can buy my own car!
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| ahead of the curve | 
having a higher grade, having better performance
 | 
In sales, we're a little ahead of the curve. But in service, we suck !
 | 
 | the bell curve - a line graph of test scores
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| ahead of the game | 
finished your work, paid all the bills, caught up
 | 
With all these expenses, we can't   seem to get ahead of the game.
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| ain't | 
isn't, is not; aren't, are not
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"It ain't easy being green," said the frog.
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| ain't half-bad | 
is quite good, is not bad, is okay
 | 
Hey, this pizza ain't half-bad. I kinda like it.
 | 
| air rage | 
angry or violent passengers on an airplane
 | 
The man struck one of the attendants. It was air rage.
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| air was blue | 
(See the air was blue)
 | 
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| airhead | 
(See an airhead)
 | 
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| airy-fairy | 
not real, impractical, pie in the sky
 | 
Sell flying saucers to little gray people? That's too airy-fairy for me!
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