Definitions from Wiktionary ( )

▸ noun:  (countable, now rare) Such a sauce more generally (not necessarily based on tomatoes, but with mushrooms, fish, etc.). This is the older meaning.
▸ verb:  (transitive) To cover with ketchup.
▸ noun:  (uncountable, chiefly US, Canada, UK) Ellipsis of tomato ketchup. A tomato-vinegar-based sauce, sometimes containing spices, onion or garlic, and (especially in the US) sweeteners.

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