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Definition of spiral verb from the Oxford Advanced American Dictionary

     

    spiral

     verb
    verb
    NAmE//ˈspaɪrəl//
     
    [intransitive]Verb Forms present simple I / you / we / they spiral
     
    he / she / it spirals
     
    past simple spiraled (Canadian English usually)spiralled
     
    -ing form spiraling (Canadian English usually)spiralling
     
     
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  1. 1(+ adv./prep.) to move in continuous circles, going upward or downward Smoke spiraled into the sky. The plane spiraled down to the ground.
  2. 2to increase rapidly the spiraling cost of health care + adv./prep. Prices are spiraling out of control.
  3. Phrasal Verbsspiral down
See spiral in the Oxford Advanced Learner's Dictionary