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spiral

2 verb
     
spiral2 past tense and past participle spiralled, present participle spiralling British English, past tense and past participle spiraled, present participle spiraling American English [intransitive]
1 [always + adverb/preposition] to move in a continuous curve that gets nearer to or further from its central point as it goes round
spiral to/around etc
The damaged plane spiralled to the ground.
2 if a situation spirals, it gets worse, more violent etc in a way that cannot be controlled:
3 if debt or the cost of something spirals, it increases quickly in a way that cannot be controlled
spiralling British English ; spiraling American English adjective:
the spiralling cost of legal services

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