A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point.
A helix.
A self-sustaining process with a lot of momentum involved, so it is difficult to accelerate or stop it at once.
To move along the path of a spiral or helix.
The falling leaves spiralled down from the tree.
To cause something to spiral.
You need to learn how to spiral a ball.
To increase continually.
Her debts were spiralling out of control.
Helical, like a spiral