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“knuckling”
The following 4 entries include the term knuckling.
knuckling under
verbto cease resistance (as to another's arguments, demands, or control)
knuckling down
verbas in pitching in, digging in
knuckling down (to)
verbas in focusing (on), concentrating (on)
knuckling under (to)
verbas in submitting (to), succumbing (to)
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Merriam-Webster unabridged