We found 6 dictionaries that define the word begin upon:

General (2 matching dictionaries)

1. begin upon: TheFreeDictionary.com
2. begin upon: Wiktionary

Business (1 matching dictionary)

3. begin upon: Legal dictionary

Computing (1 matching dictionary)

4. begin upon: Encyclopedia

Miscellaneous (1 matching dictionary)

5. begin upon: Idioms

Slang (1 matching dictionary)

6. begin upon: Green’s Dictionary of Slang

Definitions from Wiktionary (begin upon) ▸ verb:  (transitive, archaic) To physically attack (someone or something). ▸ verb:  (transitive, archaic) To verbally attack (someone or something). ▸ Words similar to begin upon ▸ Usage examples for begin upon ▸ Idioms related to begin upon ▸ Wikipedia articles (New!) ▸ Words that often appear near begin upon ▸ Rhymes of begin upon ▸ Invented words related to begin upon