As a noun, it can mean a low, continuous humming sound, a male bee that does not work, or an unmanned aircraft controlled remotely or by computer. As a verb, it means to speak in a dull, monotonous voice or to make a continuous humming noise.
From Old English 'drān' meaning 'male bee', probably imitative of its buzzing sound. The sense of a dull humming noise grew from this. The modern aircraft meaning comes from the idea of a buzzing, pilotless machine.
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