For something (actor muɴ-, CVCCV- + -um- & theme) to sway back and forth, of something resilient, securely anchored at one end, as a slender tree, pole, etc, as when climbed or blown by the wind.
An amin di āyiw ad Batad ya yimmu''ayu''āyu' ti ongol di pūo'.
All the trees in Batad continually swayed back and forth because the storm was strong.
For the wind, a person (actor umi-) to sway something resilient (theme i-) back and forth, as a slender tree, a pole, etc.
Adim iyu''āyu' nan āyiw ti ma'īpung ya nagah'a.
Don't sway the tree back and forth or it will break and you will fall.