“Mono e mono” is an error caused by mishearing the Spanish expression mano a mano which means not “man-to-man” but “hand-to-hand,” as in hand-to-hand combat: one on one.
Killing Season: Karlovy Vary Review Robert De Niro and John Travolta go mano a mano in Mark Steven Johnson's film about two ex-soldiers with some unresolved business. read more
June 30, 2013 - The Hollywood Reporter