Going underground is a phrase that can refer to a variety of activities. BURROW, DIG, HIDE, TUNNEL, HIDEOUT, and take refuge are all words that can be used to describe the act of going underground. BURROW is a six-letter word meaning to make or construct a hole or TUNNEL, usually for shelter or protection. DIG is a three-letter word meaning to break up, turn over, or move earth, sand, or other material with a tool, machine, or by hand. HIDE is a four-letter word meaning to put or keep out of sight; conceal. TUNNEL is a six-letter word meaning a passage through or under an obstruction, such as a hill or a wall. HIDEOUT is a seven-letter word meaning a place where someone hides or is concealed, especially from the law. Take refuge is a ten-letter phrase meaning to find safety or shelter from danger or distress. All of these words and phrases can be used to describe the act of going underground.