We found 18 dictionaries that define the word bone up:

General (12 matching dictionaries)

1. bone up: Merriam-Webster
2. bone up: Collins English Dictionary
3. bone up: Vocabulary.com
4. bone up: Cambridge Advanced Learner's Dictionary
5. bone up: Wiktionary
6. bone up: Dictionary.com
7. bone up: Rhymezone
8. bone up: FreeDictionary.org
9. bone up: Mnemonic Dictionary
10. bone up: TheFreeDictionary.com

Computing (1 matching dictionary)

11. bone up: Encyclopedia

Miscellaneous (2 matching dictionaries)

12. AbbreviationZ (No longer online)
13. bone up: Idioms

Slang (3 matching dictionaries)

14. bone up: Green’s Dictionary of Slang
15. bone up: English slang and colloquialisms used in the United Kingdom
16. bone up: Urban Dictionary

(Note: See bone_ups as well.)

Definitions from Wiktionary (bone up) ▸ verb:  (intransitive, slang) To study or cram, especially in order to refresh one's knowledge of a topic. Similar: mug up, swot, get up, cram, drum, bone, grind away, swot up, brace up, buckle, more... Opposite: forget, unlearn, ignore, disregard Types: cram, study, memorize, learn, drill, more... Phrases: bone up on, more... Adjectives: put up, cotton, dight, traverse, deal, man, lay, export, game on, moving, movent ▸ Words similar to bone up ▸ Usage examples for bone up ▸ Idioms related to bone up ▸ Wikipedia articles (New!) ▸ Words that often appear near bone up ▸ Rhymes of bone up ▸ Invented words related to bone up