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“knuckles”
The following 4 entries include the term knuckles.
knuckles down
verbas in pitches in, digs in
knuckles down (to)
verbas in focuses (on), concentrates (on)
knuckles under
verbto cease resistance (as to another's arguments, demands, or control)
knuckles under (to)
verbas in submits (to), succumbs (to)
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Merriam-Webster unabridged