1, The only thing to do was knuckle down and get on with some serious hard work.

2, He would not knuckle down under their pressure.

3, He managed to knuckle down to his lessons long enough to pass his examination.

4, If he doesn't knuckle down soon, he'll never get through those exams.

5, He is clearly ready to knuckle down to the task.

6, I decide to knuckle down for an hour and get the job done.

7, You're going to have to really knuckle down if you want to pass your exams.

8, I'm going to have to knuckle down to some serious study.

9, No attempts made to knuckle down and smarten up.

10, Male speaker I think we've got to knuckle down and work hard.

11, Are you going to knuckle down?

12, It's time to knuckle down to work.

13, Tom did not knuckle down under the attacks.

14, We've got to knuckle down and clean the house.

15, Let's have no more rapping and knuckle down to work.

16, You'll really have to knuckle down if you want to pass the examination.

17, You'll really have knuckle down if you want to pass the examination.

18, GLEN JOHNSON is determined to knuckle down and prove himself to Jose Mourinho.

19, Just knuckle down for an hour or so and finish.

20, You'll shoot in a truer straight line if you knuckle down.

21, If you want to pass that exam(sentencedict.com),[http://sentencedict.com/knuckle down.html] you'll have to knuckle down.

22, Mollified, if not entirely convinced, Vincent went back to Mauve and tried hard to knuckle down.

23, Social workers and their managers are clearly ready to knuckle down to the task of making the policy work for users.

24, But he kept his anger under control and vowed to knuckle down and fight for a first-team future.

25, If you want to pass that exam, you'll have to knuckle down ( to some hard work ).

26, We still have two races left, and anything can happen, so we need to knuckle down.