at the top of one's lungs
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Also, at the top of one's voice. With an extremely loud voice. For example, The babies in the nursery all were crying at the top of their lungs. The noun top here refers to the greatest degree of volume (that is, loudest) rather than high pitch, a usage dating from the mid-1500s.
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Words nearby at the top of one's lungs
at the outset, at the outside, at the point of, at the ready, at the same time, at the top of one's lungs, at the wheel, at the worst, at this point, at this rate, at this stage
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.