knuckle down to (do) (something)

To begin to undertake something in a determined and focused matter. The whole team will need to knuckle down to this project if we want to get it done by April. I have to give her credit—she really knuckled down to finish her degree.

See also: down, knuckle, to

See also:

knuckle down
knuckle down to something
knuckle under
knuckle under, to
jump in feet first
jump in with both feet
jump in with both feet, to
dive in
dive in with both feet
(Do) you want a knuckle sandwich?

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