We found 13 dictionaries that define the word beefed up:

General (11 matching dictionaries)

1. beefed up: Merriam-Webster
2. beefed-up: American Heritage Dictionary of the English Language
3. beefed-up, beefed up: Vocabulary.com
4. beefed-up: Wordnik
5. beefed up: Wiktionary
6. beefed-up: Infoplease Dictionary
7. beefed-up, beefed up: Dictionary.com
8. beefed-up: Rhymezone
9. beefed-up: FreeDictionary.org
10. beefed-up: Mnemonic Dictionary
11. beefed-up: TheFreeDictionary.com

Slang (1 matching dictionary)

12. beefed up: Urban Dictionary

Tech (1 matching dictionary)

13. AUTOMOTIVE TERMS (No longer online)

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