IPA: //ˈbɜrnˌsaɪd//
KK: /ˈbɜrnˌsaɪd/
A style of facial hair that features a moustache with hair on the cheeks but no hair on the chin.
He decided to grow a burnside to change his look.
The word 'burnside' originates from Old English, where 'burn' (meaning a small stream or brook) and 'side' (meaning a slope or hillside) combine to refer to a hillside near a stream. It describes a geographical feature, specifically a slope by a brook.
Think of a 'small stream' ('burn') next to a 'slope' ('side') — that's how you can remember that 'burnside' refers to a hillside by a stream.