So, when we say Earth is not "falling down," we're speaking…

So, when we say Earth is not "falling down," we're speaking in terms of traditional gravity on Earth where there is a clear 'down'. In space, Earth is falling around the Sun, and the solar system as a whole is also falling around the Milky Way, and our Galaxy along with the others is caught up in the dance of gravitational interactions all across the observable universe, but none of this motion can be described as 'falling' in the conventional sense because there's no bottom to fall to.