[yaw] n [origin unknown] (1546) 1: the action of yawing; esp: a side to side movement
2: the extent of the movement in yawing
[2]yaw vi (1586) 1 a of a ship: to deviate erratically from a course (as when struck by a heavy sea); esp: to move from side to side b of an airplane, spacecraft, or projectile: to turn by angular motion about the vertical axis
2: alternate "restlessly ~ing between apparent extremes --Martin Kasindorf"