Definitions of yaw:

• noun:   an erratic deflection from an intended course
• verb:   deviate erratically from a set course

  Example: "The yawing motion of the ship"

• verb:   swerve off course momentarily

  Example: "The ship yawed when the huge waves hit it"

• verb:   be wide open
• name:  A surname (very rare: popularity rank in the U.S.: #34375)