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China flagDinghui
Tibetans seem to breathe easy. Why not "easily"? Millions of Tibetans spend their days at average elevations of nearly 15,000 feet—that’s more than half the height of Mount Everest. Up there, the air is thin—with 40 percent less oxygen than at sea level. That lack of O2 would leave most Westerners struggling for breath, but Tibetans seem to breathe easy.

Answers · 6

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To "breathe easily" means that they're able to do so more than others. Saying "they breathe easy" means that, although there is less oxygen where they live, they do not struggle to breathe. Therefore they breathe easy.
0
Based on what I found here: http://idioms.thefreedictionary.com/breathe+easy, they mean the same thing. But I don't think I say "to breathe easy".
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Scientific Americans Sixty Seconds Science
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It should be "easily" or "with ease". Where did you find this phrase?

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