spiraling

1.

spirale

a shape made up of curves, each one above or wider than the one before:

:
A corkscrew is spiral-shaped.
1.

spirale

to move in a spiral:

:
With one wing damaged, the model airplane spiraled downward.
1.

spirale

shaped in a series of curves, each one above or wider than the one before:

:
a spiral staircase