Take it to the vet, it is better to do that than to clean it yourself because the vet can tell if it needs stitches or needs to be put on antibiotics from the gash. Also, the vet can tell you how to properly clean the gash on your cat.
In its most common sense, a gash is a deep cut.
Gash
Deep wound laceration
Gash, incision...
Gash, incision...
Wash it then take him/her to the vet, asap.
Go to the dentist.
Some kinds of mining leave deep gashes in the surface of the earth.The collision with the iceberg left a big gash in the hull of the titanic.
The word "gash" when used as a noun is defined as a deep cut or wound. When it is used as a verb it means to cut deeply with a knife or other sharp object.
A litter box should be at least 2-3 inches deep to ensure optimal comfort and cleanliness for your cat.
The cat litter in a litter box should be about 2-3 inches deep for optimal performance and odor control.
Rill erosion.