Catch·up Cat·sup, n.  A pureed table sauce made predominantly from tomatoes, flavored with onions, sugar, salt and spices; called also tomato ketchup. The term is also applied to pureed sauces containing mushrooms, walnuts, etc., being called in such cases mushroom ketchup, walnut ketchup, etc. [Written also ketchup.]
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  tomato ketchup
       n : thick spicy sauce made from tomatoes [syn: catsup, ketchup,
            cetchup]