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English definition of “spiral”

spiral

noun [C]  /ˈspɑɪ·rəl/ us  
a shape of a continuous, curving line that forms circles around a center point: A corkscrew is made in a spiral. fig. Roy was bitter about the downward spiral of his life (= it was becoming continuously worse).
spiral
adjective [not gradable]  /ˈspɑɪ·rəl/ us  
New playground equipment includes a large spiral slide.

spiral

verb [I]  /ˈspɑɪ·rəl/ (-l-, -ll-) us  
to move in a spiral: The engine quit, and my beautiful model airplane spiraled downward. High winds spiraled around the storm center.
(Definition of spiral from the Cambridge Academic Content Dictionary © Cambridge University Press)
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