The word "Dig" refers to the action of breaking up and moving earth, soil, or other materials with tools or by hand. It can also mean to search for something by moving things around or to understand something at a deeper level. In a more informal context, "dig" can also mean to like or appreciate something.
The word "dig" comes from the Old English word "dyggan," which means "to dig, to delve." It has evolved through Middle English "diggen" and has retained a similar form in modern English.