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plural koi
Ornamental domesticated varieties of the Amur carp (Cyprinus rubrofuscus), of Japan and eastern Asia with red-gold or white coloring. quotations examples
We sense that while it might be wonderful for Krystle and Alexis to have a catfight in a koi pond, it would be inappropriate for Joan to smack Linda with a koi.
1985 September 2, Joe Klein, quoting Douglas S. Cramer, “The Real Star of ‘Dynasty’”, in New York, page 34