Definitions for knuckle under
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Princeton's WordNet
yield, give in, succumb, knuckle under, buckle under(verb)
consent reluctantly
Wiktionary
knuckle under(Verb)
To yield or cooperate when pressured or forced to do so.
Citation
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"knuckle under." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/knuckle under>.

