The term 'IMPRINT IN GLASS' can be solved by the crossword solution 'ETCH', which is a four-letter word. Etching is a process of carving or engraving a design into glass, metal, or other materials. It is often used to create decorative designs, logos, or text on glass surfaces. The etching process involves using an acid or abrasive to cut into the surface of the material, leaving behind a permanent imprint.