Line-up
Sharpening the hairline at the forehead, temples and neck with a trimmer or razor for crisp edges.
Also: shape-up, edge-up
A line-up, also called a shape-up or edge-up, gives a short haircut sharp, straight edges. The barber uses a trimmer, and sometimes a razor, to define the front hairline, cut neat corners at the temples, square the sideburns and outline the nape. It is a signature of Black barbering and of the fade, where a crisp line makes a strong contrast with the blended sides. Line-ups grow in within days, so many people have them redone between cuts.