Mark by scratching

verb

1. To produce (something, such as a pattern or design) on a hard material by eating into the material's surface (as by acid or laser beam)
2. To subject to such etching
3. To delineate or impress clearly

   "scenes etched in our minds"

4. To practice etching

noun

1. Freeze fracture that includes the sublimation of surface ice following fracturing especially to reveal additional detail

noun phrase

1. Permanent or not able to be changed

   "These new rules are not carved in stone; if they don't work, we'll change them."