[kech-uhp, kach-]
a condiment consisting of puréed tomatoes, onions, vinegar, sugar, spices, etc.
any of various other condiments or sauces for meat, fish, etc.: mushroom ketchup; walnut ketchup.
Also, catchup, catsup.

1705–15; < Malay kəchap fish sauce, perhaps < dialectal Chinese kéjāp (Guangdong) or ke-tsiap (Xiamen), akin to Chinese qié eggplant + chī juice Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ketchup, catchup or catsup (ˈkɛtʃəp)
any of various piquant sauces containing vinegar: tomato ketchup
[C18: from Chinese (Amoy) kōetsiap brine of pickled fish, from kōe seafood + tsiap sauce]
catchup, catchup or catsup
[C18: from Chinese (Amoy) kōetsiap brine of pickled fish, from kōe seafood + tsiap sauce]
catsup, catchup or catsup
[C18: from Chinese (Amoy) kōetsiap brine of pickled fish, from kōe seafood + tsiap sauce]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1711, from Malay kichap, from Chinese (Amoy dial.) koechiap "brine of fish." Catsup (earlier catchup) is a failed attempt at Anglicization, still in use in U.S. Originally a fish sauce, early English recipes included among their ingredients mushrooms, walnuts, cucumbers, and oysters. Modern form of the
sauce began to emerge when U.S. seamen added tomatoes.
Online Etymology Dictionary, © 2010 Douglas Harper
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Encyclopedia Britannica


seasoned pureed condiment widely used in the United States and Great Britain. American ketchup is a sweet puree of tomatoes, onions, and green peppers flavoured with vinegar and pickling spice that is eaten with meats, especially beef, and frequently with french fried potatoes (British chips); it is the universal condiment of certain fast-food sandwiches. In Britain, as formerly in the United States, ketchup is a puree based on mushrooms, unripe walnuts, or oysters; this ketchup functions primarily as a seasoning for cooking. The word derives from the Chinese ke-tsiap, a fish brine, probably by way of the Malaysian ketjap

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
New coating should make it easier to get more ketchup or mayonnaise out of the
Well, now we're heading for a similar ketchup effect for real functioning
  renewable technologies.
If you are looking in your fridge for the ketchup bottle, you go over and over
  and can't find it.
The ketchup, red and decadent, embedded with little flecks of grated onion.
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