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We found 16 dictionaries with English definitions that include the word one up:
Click on the first link on a line below to go directly to a page where "one up" is defined.

General (13 matching dictionaries)

1. one-up, one up: Merriam-Webster.com [home, info]
2. one up: Oxford Learner's Dictionaries [home, info]
3. one-up: American Heritage Dictionary of the English Language [home, info]
4. one-up, one-up: Collins English Dictionary [home, info]
5. one-up: Wordnik [home, info]
6. one-up, one up: Wiktionary [home, info]
7. one-up, one up: Dictionary.com [home, info]
8. one-up: Free Dictionary [home, info]
9. one-up: Dictionary/thesaurus [home, info]
10. one-up: The Wordsmyth English Dictionary-Thesaurus [home, info]
11. One up: Dictionary/thesaurus [home, info]
12. one up: Infoplease Dictionary [home, info]
13. one-up: Webster's New World College Dictionary, 4th Ed. [home, info]

Computing (1 matching dictionary)

14. One-up: Game Dictionary [home, info]

Slang (1 matching dictionary)

15. One Up, one-up: Urban Dictionary [home, info]

Sports (1 matching dictionary)

16. one up: Golfer's Dictionary [home, info]

Quick definitions from Wiktionary (one up) ▸ verb:  (idiomatic) To outdo, to perform something slightly better than a competitor's prior effort. ▸ noun:  (especially in phrases like get one up on someone) An advantage over someone. ▸ noun:  (video games) Alternative spelling of 1-up (“extra life”) [(video games) An item that grants the player an extra life in the game, staving off game over by one more try.] ▸ Words similar to one up ▸ Usage examples for one up ▸ Idioms related to one up (New!) ▸ Words that often appear near one up ▸ Rhymes of one up ▸ Invented words related to one up