side parting; hair parted to one side
Refers to a hairstyle where the hair is parted roughly 70% to one side and 30% to the other, creating an asymmetrical look.
彼はいつも七三分けにしている。
He always wears his hair in a side parting.
Compound of 七 (seven), 三 (three), and 分け (parting), literally 'seven-three parting', describing the approximate ratio of hair distribution.