厮搏

厮搏	sī bó	to come to blows; to fight; to tussle
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)
搏	bó	to fight / to combat / to seize / (of heart) to beat