horse marine
Americannoun
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(formerly) a marine mounted on horseback or a cavalryman doing duty on shipboard.
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a person out of their proper or natural place.
noun
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(formerly) a mounted marine or cavalryman serving in a ship
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someone out of his natural element, as if a member of an imaginary body of marine cavalry
Etymology
Origin of horse marine
First recorded in 1810–20
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.