knuckled under; knuckling under; knuckles under
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“Knuckle under.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/knuckle%20under. Accessed 27 Jun. 2022.
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Time Traveler for knuckle under
The first known use of knuckle under was in 1869
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