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jackknife-fish

American  
[jak-nahyf-fish] / ˈdʒækˌnaɪfˌfɪʃ /

noun

Ichthyology.

plural

jackknife-fishes,

plural

jackknife-fish

  1. a black and white, American drum, Equetus lanceolatus, found in tropical areas of the Atlantic Ocean, having an elongated dorsal fin that is held erect.

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.