For a linear object anchored at one end (actor muɴ-, -um- & theme) to sway, as a house when walking in it or when the wind blows; more rarely, a loose post, tooth.
For someone or something (actor umi-) to sway a linear object (theme i-), as described above; as for the wind, an earthquake to sway a house back and forth, someone to wiggle a loose tooth, a stake.