(third-person singular simple present knuckles under, present participle knuckling under, simple past and past participle knuckled under)
"knuckle-under." YourDictionary, n.d. Web. 18 October 2018. <http://www.yourdictionary.com/knuckle-under>.
knuckle-under. (n.d.). Retrieved October 18th, 2018, from http://www.yourdictionary.com/knuckle-under
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