We found 9 dictionaries that define the word knuckles down:

General (6 matching dictionaries)

1. knuckles down: Merriam-Webster
2. knuckles down: Collins English Dictionary
3. knuckles down: Vocabulary.com
4. knuckles down: Cambridge Advanced Learner's Dictionary
5. knuckles down: Wiktionary
6. knuckles down: TheFreeDictionary.com

Computing (1 matching dictionary)

7. knuckles down: Encyclopedia

Medicine (1 matching dictionary)

8. knuckles down: Medical dictionary

Miscellaneous (1 matching dictionary)

9. knuckles down: Idioms

▸ Words similar to knuckles down ▸ Usage examples for knuckles down ▸ Idioms related to knuckles down ▸ Wikipedia articles (New!) ▸ Words that often appear near knuckles down ▸ Rhymes of knuckles down ▸ Invented words related to knuckles down