A drum is a musical instrument consisting of a skin stretched tightly over a round frame. You play a drum by beating it with sticks or with your hands.

A drum is a large cylindrical container which is used to store fuel or other substances.

A drum is a hollow cylindrical structure which is part of a machine, for example a washing machine.

A drum is a circular object on which wire or rope is wound and kept.

If something drums on a surface, or if you drum something on a surface, it hits it regularly, making a continuous beating sound.

If someone beats the drum or bangs the drum for something, they support it strongly.