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spiral  (spirals plural & 3rd person present) (spiralling present participle) (spiralled past tense & past participle )
in AM, use  spiraling,  spiraled  
1  n-count A spiral is a shape which winds round and round, with each curve above or outside the previous one. 
  Spiral is also an adjective., adj ADJ n 
...a spiral staircase.  
2  verb If something spirals or is spiralled somewhere, it grows or moves in a spiral curve. 
Vines spiraled upward toward the roof...  V adv/prep 
A joss stick spiralled smoke.  V n, Also V 
  Spiral is also a noun., n-count 
Larks were rising in spirals from the ridge.  
3  verb If an amount or level spirals, it rises quickly and at an increasing rate. 
Production costs began to spiral.  V 
...a spiralling trend of violence...  V -ing 
The divorce rate is spiralling upwards.  V adv/prep 
  Spiral is also a noun., n-sing with supp 
...an inflationary spiral., ...a spiral of debt.  
4  verb If an amount or level spirals downwards, it falls quickly and at an increasing rate. 
House prices will continue to spiral downwards.  V adv/prep 



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