'shiner' originates from English, specifically the word 'shine,' where 'shine' meant 'to emit light or glow.'

'shine' transformed into the noun 'shiner' to describe something that shines or glows, eventually becoming associated with a black eye due to the shiny appearance of the bruise.

Initially, it meant 'something that shines,' but over time it evolved into its current meaning of 'a black eye or small fish.'