"Spiralling costs" means that expenses or prices are continuously and quickly increasing in an uncontrollable manner, much like a spiral that keeps growing larger and larger. Full definition
The alliance was a sign of just how frustrated American businesses are with the state of the nation's health care system and the rapidly spiraling cost of medical treatment. (nytimes.com)
Spiraling costs for long - term care insurance have prompted many insurance carriers to exit that market, but some «smart» ones have tacked on long - term care to life insurance policies. (nbr.com)
The offshore Trianel Borkum wind park severely hampered by spiraling costs, lower than expected winds. (greenwichneighborsunited.com)