vermimisele sarnane külmvormimisoperatsioon - reljeefi sissevajutamine lehtmetalli ilma tooriku paksuse muutmiseta (vrd vermimine); jäikusribide moodustamise korral nimetatakse protsessi ribistuseks, a process for producing raised or sunken designs in sheet material by means of male and female dies, theoretically with minimal change in metal thickness; examples are ribs for stiffening, letters, and ornamental pictures