at the top of one's form
at the top of one's lungs
at the top of one's/the class
“At the top of one's lungs.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/at%20the%20top%20of%20one%27s%20lungs. Accessed 7 Dec. 2022.
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