厮杀

厮杀	sī shā	to fight at close quarters; to fight tooth and nail
厮	sī	variant of 厮
厮	sī	(bound form) together; each other / (bound form) male servant / (bound form) dude; so-and-so (used in 那厮 and 这厮)
杀	shā	to kill; to slay; to murder; to attack / to weaken; to reduce / (dialect) to smart / (used after a verb) extremely