To engrave is to carve into something, especially stone. Sometimes people have messages engraved inside their wedding rings, their iPods, or any other rock-hard surface that can handle it.
Words are engraved on tombstones to honor the people who died. Grave used to mean “to dig or carve” but no one uses it that way anymore because they would say engrave instead. Anytime a hard surface has a message or picture cut into, it was engraved. Sometimes engraving isn’t physical. A super fun birthday when your long lost grandmother rode in on a stallion could be engraved in your mind forever. Both kinds of engraving leave an impression.