pa-, mag- -an (repet.)
voluntary
-um-, Cew- (repet.)
Fall down, duck down (hitting forehead or face).
Duck down so that you won’t be hit by what is thrown.
I stumbled (hit my foot) on a stone; I almost fell flat on my face.
I kept falling because I hurried.
Don’t keep hitting your head (on the ground) so that your neck will not start hurting.