To surge or roll in billows.
To swell out or bulge.
A large wave, swell, surge, or undulating mass of something, such as water, smoke, fabric or sound
To cause something to spiral.
To increase continually.
To move along the path of a spiral or helix.
A helix.
A section of track that forms a circle and crosses over itself, used for gaining height in mountainous territory.
A self-sustaining process with a lot of momentum involved, so it is difficult to accelerate or stop it at once.
A curve that is the locus of a point that rotates about a fixed point while continuously increasing its distance from that point.
Helical, like a spiral.