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English definition of “spiral”

spiral

noun [C]     /ˈspaɪə.rəl/ US  /ˈspaɪr.əl/
a shape made up of curves, each one above or wider than the one before: A corkscrew is spiral-shaped.Bends, loops and curves downward spiral C2 a situation in which a price, etc. becomes lower, or a situation gets worse and is difficult to control because one bad event causes another: This year's downward spiral of house prices has depressed the market. We must avoid the downward spiral in which unemployment leads to homelessness and then to crime.Uncontrolled
(Definition of spiral noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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