side hair
Refers to the hair on the sides of the head, often in the context of hairstyles or grooming.
She tucked her side hair behind her ear.
美容師に横髪を短く切ってもらった。
I had the hairdresser cut my side hair short.
Compound of 横 (yoko, 'side') and 髪 (kami, 'hair'). The reading よこがみ is a straightforward combination.