We found 15 dictionaries that define the word knees up:

General (12 matching dictionaries)

1. knees up: Longman Dictionary of Contemporary English
2. knees-up: Merriam-Webster
3. knees-up: Oxford Learner's Dictionaries
4. knees-up, knees-up: Collins English Dictionary
5. knees-up: Wordnik
6. knees-up: Cambridge Advanced Learner's Dictionary
7. knees-up: Wiktionary
8. knees-up: Infoplease Dictionary
9. knees-up, knees up: Dictionary.com
10. knees-up: TheFreeDictionary.com

Computing (1 matching dictionary)

11. knees-up: Encyclopedia

Slang (2 matching dictionaries)

12. knees-up: English slang and colloquialisms used in the United Kingdom
13. knees up: Urban Dictionary

Phrases: Knees Up Mother Brown, sitting with your knees up, more... ▸ Words similar to knees up ▸ Usage examples for knees up ▸ Idioms related to knees up ▸ Wikipedia articles (New!) ▸ Words that often appear near knees up ▸ Rhymes of knees up ▸ Invented words related to knees up