In a state of whirring; making a continuous buzzing or humming sound.
From 'a-' plus 'whir' (echoic word representing a buzzing sound). The 'a-' prefix converts the verb into an adverbial state of being, creating a vivid sensory description.
Echoic words like 'whir,' 'buzz,' and 'hum' are fun because they imitate the actual sounds they describe—and adding 'a-' to them creates this perfect snapshot of ongoing motion and sound!
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