The term 'go to and fro' can be broken down into four crossword solutions: PACE (4 letters), ROCK (4 letters), SWAY (4 letters), and WAG (3 letters). PACE means to move at a steady speed, usually in a regular rhythm. ROCK is an action of moving back and forth or side to side. SWAY is a movement from one side to the other, often in a gentle or rhythmic manner. Finally, WAG is an action of swinging or swaying from side to side. All of these words describe the action of going to and fro, which is the act of moving back and forth between two places.