As we approach the rumble of guns grows louder and alternates with the whir of cannonballs, which begin to attract his attention.
The whir of the circling NYPD helicopter muffled their chants calling for unity and calling out police brutality.
c.1400, Scottish, "fling, hurl," probably from Old Norse hvirfla, frequentative of hverfa "to turn" (see wharf). Cf. Danish hvirvle, Dutch wervelen, German wirbeln "to whirl." Related: Whirred; whirring.