[intransitive] (-ll-, NAmE usually -l-) (usually used with an adverb or a preposition 通常与副词或介词连用) to increase rapidly快速增长；螺旋式上升◆Prices are spiralling out of control.价格飞涨失去控制。◆spiralling costs/debts飞涨的成本；快速增加的债务 ●ˌspiral ˈdown/ˈdownwardsto decrease rapidly快速下降◆Their shares have continued to spiral downwards.他们的股票持续快速下跌。