Why do you call fists dukes?

The term "dukes" as a slang for fists is believed to originate from the phrase "dukes of the boxing," referring to the boxing gloves used in the sport. It may also be linked to the phrase "put up your dukes," which means to raise your fists in preparation for a fight. The association with fighting and the imagery of raising one's fists for combat contributed to the colloquial use of "dukes."