Why are 'sideburns' called so?
Sideburns, which refer to facial hair grown on the sides of the face, are named after 19th century American General Ambrose Burnside. His style, facial hair on the cheeks connected to a moustache while the chin being clean shaven, was referred to as 'burnsides'. The style was later renamed 'sideburns' as the facial hair were on sides of the face.