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“knuckle”
The following 5 entries include the term knuckle.
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
verbto cease resistance (as to another's arguments, demands, or control)
knuckle under (to)
verbas in submit (to), succumb (to)
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Merriam-Webster unabridged
