'red-orange' originates from the combination of the words 'red' and 'orange', where 'red' meant 'the color of blood' and 'orange' referred to the fruit and its color.

'red-orange' evolved from the simple combination of the words 'red' and 'orange' to describe a specific hue.

Initially, it meant a simple mix of red and orange, and this meaning has largely remained the same in modern usage.