Artificial gravity as an engine

I have seen some people talk about the idea of ships using their magical anti-gravity systems in a story in order to not only give ships a standard floor layout and inertial dampener systems, but to also propel the ship forward through space.

As much as this works for ideas like mass relays from mass effect as those give the ship something to push against, could it work as a stand alone engine system?
It won't have anything to push against in space, and without the gravity of a planet to hold it down making the ship lighter won't do anything either, so I can't tell if this would work or not.

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Artificial gravity as an engine

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