As a verb, it means to move around quickly and busily. As a noun, it refers to noisy, energetic activity in a place.
From early 17th-century English, originally meaning 'to act with vigor or fuss.' Its exact origin is uncertain, but it may be related to older words meaning 'to rush' or 'to shake.' Over time, it shifted from describing individual movement to describing the overall busy feel of a place.
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