spiral/ 'spaɪərl /

1.noun [c] 
螺旋

2.vi.[smoke+] 
to spiral (upwards) 盘旋(上升)

3.vi.[prices etc+] 
不断急剧上升

4.vi.[prices] [ rates+] 
to spiral downwards 不断急剧下降

5.vi.[person+] 
每况愈下

a spiral of debt
一连串债务
a downward spiral
一连串的倒霉事