To make a long, loud, mournful cry, often associated with wolves or dogs. The wolves began to howl at the full moon.
To cry out loudly in pain, anger, or amusement. The child began to howl when he fell off his bike.
To produce a sound resembling a howl, often due to wind or other natural forces. The wind began to howl through the trees as the storm approached.
To express something vocally in a loud, prolonged manner. The fans began to howl their disapproval at the referee's decision.