surplus
if you have a two engine plane (not centerline thrust) and one engine quits, the plane will turn towards the dead engine if you do nothing else.
the good engine will push you towards the bad engine if that makes sense.
and if you allow airspeed to decay (reduce) the turn towards the dead engine can become uncontrollable.
so, if the left (port) engine quit, the plane would turn left unless the pilot was on top of things and pressed the "right/starboard" rudder pedal.