(formerly) a marine mounted on horseback or a cavalryman doing duty on shipboard.
a person out of his or her proper or natural place.
Origin of horse marine
First recorded in 1810–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for horse marine
Historical Examples of horse marine
He did not look much like a horse-marine, but reminded me more of a city hosier.The Memoirs of Harriette Wilson, Volumes One and Two
What, do you mean to say that lankey, horse-marine looking fellow is as bad as that!Varney the Vampire
Thomas Preskett Prest
(formerly) a mounted marine or cavalryman serving in a ship
someone out of his natural element, as if a member of an imaginary body of marine cavalry
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012