Definitions of drum:

• noun:   small to medium-sized bottom-dwelling food and game fishes of shallow coastal and fresh waters that make a drumming noise
• noun:   a musical percussion instrument; usually consists of a hollow cylinder with a membrane stretch across each end
• noun:   a cylindrical metal container used for shipping or storage of liquids
• noun:   the sound of a drum

  Example: "He could hear the drums before he heard the fifes"

• noun:   a hollow cast-iron cylinder attached to the wheel that forms part of the brakes
• noun:   a bulging cylindrical shape; hollow with flat ends
• verb:   make a rhythmic sound

  Example: "Rain drummed against the windshield"

• verb:   play a percussion instrument
• verb:   study intensively, as before an exam
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #6923)