- a crack or fissure in the hoof of a horse, extending from the coronet downward toward the sole, caused by a dryness of horn.
Origin of sand crack
First recorded in 1745–55
Also called quarter crack.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for sand crack
It becomes dry and brittle, and extremely liable to sand-crack.
Sand-crack of the frog and sand-crack of the sole may also each be met with.
Unskilful shoeing also plays a part in the causation of sand-crack.
I never knew a broken knee that wasn't got by striking the manger, nor a sand-crack that didn't come of an awkward smith.'Lord Kilgobbin
Often, too, cracks will appear in the horn of the quarters, and a troublesome and incurable form of sand-crack results.