Definition of: yaw

(yô) v.i.
1. Naut. To steer wildly or out of its course, as a ship when struck by a heavy sea.
2. To move unsteadily or irregularly.
3. Aeron. To deviate from the flight path by angular displacement about the vertical axis; fishtail.
—v.t.
4. To cause to yaw.
—noun
1. A movement of a ship or aircraft by which it temporarily alters its course.
2. Irregular, unsteady, or deviating motion. [Cf. ON jaga move to and fro]