light chamfering
Engineering term for a very small bevel or chamfer, often just breaking a sharp edge. The 糸 (thread) suggests a fine, thread-like chamfer.
Light chamfering was applied to this part to remove burrs.
Compound of 糸 (thread, suggesting fineness) and 面取り (chamfering). The exact origin is uncertain, but it likely arose in engineering contexts to describe a minimal chamfer.