If one species of animal or plant cross-breeds with another, they reproduce, and new or different animals or plants are produced. You can also say that someone cross-breeds something such as an animal or plant. By cross-breeding with our native red deer, the skia deer have affected the gene pool Unfortunately attempts to crossbreed it with other potatoes have been unsuccessful Dr Russel is creating an elite herd by cross-breeding goats from around the globe. a cross-bred labrador