have you ever heard of the doomsday defense?  the [dallas cowboys] appeared in 5 superbowls with their doomsday defense
"the doomsday defense was the nickname given to the famous defensive of the american football team the [dallas cowboys] during their late 1960s - 1970s [dynasty] years
"have you ever heard of the doomsday defense?  the [dallas cowboys] appeared in 5 superbowls with their doomsday defense" What is the definition of "doomsday defense"?