whirr UK /wɜː/US /wɝ/verb 4noun 3forms 4 verb4 •To move or vibrate (something) with a buzzing sound. •To make a sibilant buzzing or droning sound. •To cause (something) to make such a sound. •(of a panther) To make a vibrating sound in its throat when contented, much like the domestic cat’s purr. noun3 •A sibilant buzz or vibration; the sound of something in rapid motion.As Jane turned from the telephone she heard the whirr of a motor. That would be the children coming home from school. The car called for them at the playground every afternoon at five. — 1930 •The vibrating sound made by a panther in its throat when contented. •A bustle of noise and excitement. formswhirred · whirring · whirreth · whirrs