moving in a continuous curve that winds around a central point 螺旋形的；螺旋式的
[I] (+ adv./prep.)to move in continuous circles, going upwards or downwards 螺旋式上升（或下降）；盘旋上升（或下降）
The plane spiralled down to the ground.
飞机盘旋降落。
[I] to increase rapidly 急剧增长
the spiralling cost of health care
急剧上涨的医疗费用
+ adv./prep.
Prices are spiralling out of control.
物价飞涨，失去控制