V to n
II.20 The 'knuckle down' group
These verbs are concerned with starting or continuing a task.
If you'll excuse me, I really have to get back to work.
Right, lads, let's get down to work.
He then returned to his examination of the distant vessel.
The preposition to is sometimes followed by an '-ing' clause.
return turn buckle down get around/round get back get down go back knuckle down settle down
I knew I needed a house for Rebecca to be independent in, so I knuckled down to getting it for her.