1) Deviating from course 2) Going off course 3) Slightly off course 4) Swerve off course momentarily 5) Turning about the vertical 6) Zigging or zagging Found on https://www.crosswordclues.com/clue/yawing
An unstable side-to-side motion, about the vertical axis of an aeroplane, which may be described as rotary or angular.
Found on https://www.encyclo.co.uk/local/20784