one's level best
noun
: one's best effort at doing something
He tried his level best to win the race.
She did her level best to please her mother.
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“One's level best.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/one%27s%20level%20best. Accessed 24 Apr. 2024.
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