"Degüello" is a Spanish noun from the verb "degollar", to describe the action of throat-cutting. More figuratively, it means "give no quarter." It "signifies the act of beheading or throat-cutting and in Spanish history became associated with the battle music, which, in different versions, meant complete destruction of the enemy without mercy." It is similar to the war cry "¡A degüello!" used by Cuban rebels in the 19th century to launch mounted charges against the Spanish infantry.

Dimitri Tiomkin, El Degüello