The crossword solution for the term MARK INDELIBLY is ETCH. To ETCH something means to carve or engrave a design, text, or pattern into a hard surface, usually with a sharp tool. This term is often used in reference to metal or stone, but it can also be used to describe the process of creating a design on glass or other materials. Etching is a permanent form of marking, and is often used to create artwork or to mark items with important information.