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We found 4 dictionaries with English definitions that include the word gen up: Click on the first link on a line below to go directly to a page where "gen up" is defined. General (3 matching dictionaries) gen up: Collins English Dictionary [home, info] gen up: Cambridge Advanced Learner's Dictionary [home, info] gen up: Dictionary/thesaurus [home, info] Slang (1 matching dictionary) gen (someone) up: English slang and colloquialisms used in the United Kingdom [home, info]