はえぎわ
hairline; borders of the hair
Also written 生えぎわ、生際
Noun
あいつ、おでこが広ひろいだけだって言いってるけどさ、要ようは生はえ際ぎわが後退こうたいしてるってことだろ。
That guy said he had a wide, prominent forehead, but in fact, his hairline is receding.