Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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catch up to reach the same distance or level as another or others who are further ahead (usu. fol. by "to" or "with"). [2 definitions]
catch-up any attempt to overtake one who is ahead, as in a game.
catchup a variant of ketchup.
ketchup a thick sauce for meat or potatoes, usu. made with tomato purée and spices.