whirr(noun, verb) noun1. sound of something in rapid motionSimilar word(s): birr, whir, whirringDefinition categories: event, sound verb1. make a soft swishing sound- the motor whirredSimilar word(s): birr, purr, whir, whiz, whizzDefinition categories: perception, go, sound2. make a vibrant sound, as of some birdsSimilar word(s): churrDefinition categories: communication, emit, utter