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“knuckle”
The following 5 entries include the term knuckle.
knuckle under
verbto cease resistance (as to another's arguments, demands, or control)
bare-knuckle
adjectiveas in in-your-face, take-no-prisoners
knuckle down
verbas in pitch in, dig in
knuckle down (to)
verbas in focus (on), concentrate (on)
knuckle under (to)
verbas in submit (to), succumb (to)
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Merriam-Webster unabridged
