› (also spiral up/upward(s)) if costs, prices, etc. spiral, they increase quickly: Costs spiral, and the patient is subjected to tests they don't need. Inflation began to spiral upward.spiral (from sth) to sth The country's foreign debt spiralled from $840 million to $2.6 billion.
spiral downwards › if costs, prices, etc. spiral downwards, they go down quickly: Stock prices have spiralled downwards for the past two weeks.
spiral out of control › if a situation spirals out of control, it becomes impossible to control because one bad event causes another: The project spiraled out of control, running $300 million over budget. There is a great deal of evidence that internet gambling is spiralling rapidly out of control. spiralling (US spiraling) › spiralling fuel costs