lung

have a [fine/good etc.] pair of lungs (humorous)

if you say that a baby has a good pair of lungs, you mean that they can cry very loudly. Well she's got a fine pair of lungs, I'll say that for her!

See also: fine, good, pair

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at the top of your lungs

as loudly as you can. She sang the national anthem at the top of her lungs.

See also: top