To withdraw from a competition or situation, often by signaling submission or defeat. After a long and grueling match, the wrestler decided to tap out, conceding victory to his opponent.
To type or enter information using a keyboard or keypad. She quickly tapped out a message on her phone to let her friend know she was running late.
To produce a rhythm or beat by tapping. He tapped out a catchy tune on the table with his fingers while waiting for his coffee.