EXAMPLES FROM THE WEB FOR KNUCKLE DOWN
Meanwhile, put aside all that idea and knuckle down and help.
I get wore out lots of times and knuckle down, but Dr. Hugh won't.
Well, my good times are over, and I'll have to knuckle down to work now.
The human family will not knuckle down and swallow the truth.
If you are cowardly, she will be bold; but if you are bold and resolute, she will knuckle down.
But, even if he requests it were not going to knuckle down to Skeel; are we?
I know what I'm about—I'll make him knuckle down—never fear me!
I wasn't overfond of the job I had on the ship, but I had to knuckle down to it all the same.
Only one has to knuckle down to these wretched exams first.'
But the commander refused to knuckle down to any show of arrogance.