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English definition of “spiral”

spiral

verb [I usually + adv/prep]     /ˈspaɪə.rəl/ US  /ˈspaɪr.əl/ (-ll- or US usually -l-)
to move in a spiral: With one wing damaged , the model airplane spiralled downwards .Moving downwardsFalling and dropping If costs , prices , etc. spiral, they increase faster and faster : Spiralling costs have squeezed profits .Value and price increases spiral downwards (of prices , etc.) to get less, at a faster and faster rate Value and price decreases
(Definition of spiral verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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