- (US standard of identity) A food comprising tomato concentrate and any of vinegar, sweetener, spices, flavoring, onion, and garlic.
- (uncountable) A tomato-vinegar based sauce.
- (countable) Such a sauce more generally (not necessarily based on tomatoes), or a specific brand or kind of such sauce.
"fish ketchup; fruit ketchup; mushroom ketchup"
- (transitive) To cover with ketchup.