yaw in WordNet English dictionary

1. be wide open
   "the deep gaping canyon"
   gape  yawn  yaw 
   
2. deviate erratically from a set course
   "the yawing motion of the ship"
   yaw 
   
3. swerve off course momentarily
   "the ship yawed when the huge waves hit it"
   yaw 
   

1. an erratic deflection from an intended course
   yaw  swerve