Moving by jumping on one foot or with both feet together; can also mean very busy or active.
From Old English 'hoppian' meaning to leap or dance, related to Germanic roots. The sense of 'very busy' developed in the 20th century from the image of rapid, energetic movement.
The phrase 'hopping mad' uses the physical action of hopping to express extreme anger, reflecting how humans often describe emotions through bodily movements. This connection between physical action and emotional states appears across many languages and cultures.
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