coach horse

a horse, usually strong and heavily built, for drawing a coach.

Origin of coach horse

First recorded in 1580–90

And I shall begin with our familiar and unsavoury old friend, the Devil's Coach-horse.

The Strand Magazine, Volume XVII, February 1899, No. 98. |Various
The scientific name of the dardaol is "ocypus olens," in English he is sometimes called the "devil's coach-horse."

Legends of Saints & Sinners |Douglas Hyde
But the Devil's Coach-horse makes it serve a double purpose.

The Strand Magazine, Volume XVII, February 1899, No. 98. |Various
They might just as well have settled that he was a coach-horse, and could just as easily have called him one.

A Child's History of England |Charles Dickens

Of course, however, it is just these insect-eating birds that the Devil's Coach-horse has most to fear from.

The Strand Magazine, Volume XVII, February 1899, No. 98. |Various