In short and simple terms, the phrase "knife fight" refers to a violent confrontation or battle where people fight each other using knives as weapons.
Sentences with «knife fight»
Two scenes where women engage in knife fight, once to entertain an audience, the other with the intent to kill. (parentpreviews.com)
It actually was two player, and way more fun to stick traps to a friend and get into knife fights with them instead of a computer player. (thedreadpirateguy.com)
«All the Way,» then, is one prolonged knife fight. (latimes.com)