Idiom: knuckle down
— It’s final exam week so I’ve got to knuckle down and finally start studying.
— I didn’t do anything all morning but I was able to knuckle down and finish my report this afternoon.
— Sorry, I can't talk now. I've got to knuckle down and do my homework.
— We knuckled down all season and now that it's over I'm going to go out and get drunk.
— Please knuckle down and finish cleaning up your room so you can work on the garage tomorrow.
— I have to knuckle down and address 125 Christmas cards tonight so I can mail them in time for them to arrive before the holiday.
— If we just knuckle down today, we can finish up painting the kitchen.
— I'm going to the library. Every time I try to knuckle down and work one of my roommates interrupts me.
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