IPA: //ˈsaɪdˌbɜrn//
KK: /ˈsaɪdˌbɜrn/
A type of facial hair that grows along the sides of the face, extending down to the jawline, often in front of the ears.
He decided to grow his sideburns longer to match his new hairstyle.
Sideburn is formed from "side" (from Old English "side", meaning the lateral part) and "burn" (from the word "burns" in the 19th century, referring to a tuft of hair). The term describes hair that grows on the sides of the face, particularly in front of the ears.
Think of the 'side' of your face where the 'burn' of hair grows — that's how you remember that sideburns are the hair on the sides of the face.
No commonly confused words.