DictionarycareenUnsteady movement
verb

careen

kuh-REEN/kəˈriːn/

Move wildly, swerving or lurching from side to side.

The cyclist careens downhill, struggling to control the sharply swerving bicycle.

A cyclist hurtles downhill, bicycle leaning sharply and front wheel veering sideways as she struggles to keep her balance.
Etymology

Exposing a ship's keel required turning it on its side, leading to the sense of tilting or lurching. Confusion with career, meaning “move rapidly,” helped produce the sense of fast, unsteady movement.

More examples

  • He careened around the corner on his bicycle.
  • The boat careens through the choppy water.
  • Loose barrels go careening across the slippery deck.

Forms

careen · careens · careened · careening

Similar words

swerve
Describes a sharp change of direction, not necessarily uncontrolled motion.
lurch
Suggests a sudden unsteady movement rather than sustained speed.