Wiki-Push back

This is one of the processes applied to the back of Japanese knives, and refers to the process of flattening the hollowed-out back edge of the overall back surface by Urasuki. By making both edges horizontal across the indentations, the food can be cut straight through.

Related websites
Decoding Japanese Knives: Understanding Parts and Names | KIREAJI
Mastering Japanese Knife Sharpening: Techniques & Tips | KIREAJI