We found 30 dictionaries that define the word sharpen:

General (24 matching dictionaries)

1. sharpen: Longman Dictionary of Contemporary English
2. sharpen: Merriam-Webster
3. sharpen: Oxford Learner's Dictionaries
4. sharpen: American Heritage Dictionary of the English Language
5. sharpen: Collins English Dictionary
6. sharpen: Vocabulary.com
7. Sharpen, sharpen: Wordnik
8. sharpen: Cambridge Advanced Learner's Dictionary
9. sharpen: Wiktionary
10. sharpen: Webster's New World College Dictionary, 4th Ed.
11. sharpen: The Wordsmyth English Dictionary-Thesaurus
12. sharpen: Infoplease Dictionary
13. sharpen: Dictionary.com
14. sharpen: Cambridge Essential American English Dictionary
15. Sharpen: Online Plain Text English Dictionary
16. sharpen: Webster's Revised Unabridged, 1913 Edition
17. sharpen: Rhymezone
18. Sharpen: AllWords.com Multi-Lingual Dictionary
19. sharpen: Webster's 1828 Dictionary
20. sharpen: FreeDictionary.org
21. sharpen: Mnemonic Dictionary
22. sharpen: TheFreeDictionary.com

Art (1 matching dictionary)

23. English-Chinese Dictionary of Graphic Communications (Big 5) (No longer online)

Business (1 matching dictionary)

24. sharpen: Legal dictionary

Computing (1 matching dictionary)

25. sharpen: Encyclopedia

Medicine (1 matching dictionary)

26. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

27. Brilliant Dream Dictionary (No longer online)

Slang (1 matching dictionary)

28. Sharpen: Urban Dictionary

(Note: See sharpened as well.)

Definitions from Wiktionary ( ) ▸ verb:  (transitive, sometimes figurative) To make sharp. ▸ verb:  (intransitive) To become sharp. Similar: heighten, taper, point, focus, sharpen up, whet, steel, whetstone, Harden, polish up, more... Opposite: dull, blunt Types: whetstone, steel, ceramic, diamond, sandpaper, more... Phrases: sharpen up, sharpen a blade, sharpen by rubbing, sharpen skills, sharpen your skills, more... Colors:     steel blue,     slate gray,     charcoal,     gunmetal,     graphite, more... ▸ Words similar to sharpen ▸ Usage examples for sharpen ▸ Idioms related to sharpen ▸ Wikipedia articles (New!) ▸ Words that often appear near sharpen ▸ Rhymes of sharpen ▸ Invented words related to sharpen