The phrase "have been spiralling" is correct and usable in written English.
You can use it when describing something that has been steadily and rapidly increasing in intensity or size. For example, "The prices of everyday items have been spiralling ever since the global pandemic began."
UK grosses for Sparks films have been spiralling downwards for a while now.
In the end, the conquest came as a surprise.Mangala Samaraweera, an opposition MP, says casualty figures have been spiralling since September, forcing the government to suppress "the stark reality of war".
It is hoped that both transfer fees and wages, which have been spiralling ever-upwards, will now show some restraint and stability.
At the same time four companies control over half of world coffee sales and their revenues have been spiralling upwards to over USD 100 billion a year, at the same time as some of the poorest families in the world have seen their incomes disappear into nothing.
ImClone's shares, which have been spiraling downward all month, fell an additional $3.09, or 16percentto to $16.49.
The debts have been spiraling out of control for a while; for five years the club sent no reports to the Mercantile Registry and, when there was no room left for maneuver, they stopped paying their taxes.
Prescription drug costs have been spiraling insistently upwards.
In the last sixteen years, as cell phone use has been jetting upward, traffic fatalities have been spiraling downward.
We have been spiraling downward for some time, beginning in the '50s with the Playboy philosophy that gave men permission to avoid the bonds of marriage if they wanted to have sex.
A spokesman for the Department for Work and Pensions defended the freeze, saying: "The reality is the housing benefit bill has been spiralling for decades.
Zika has been spiralling in Singapore since the beginning of September, with health officials updating the number of cases to 275 on Tuesday, including two pregnant women.
