For something (actor muɴ-, -um- & theme) to roll, tilt or twist slightly, as for a stone to roll slightly when stepped on, a warped floor board to twist when stepped on.
Mungkellob han inumbuna'.
That which I sat on twisted.
For someone (agent) to roll, tilt, or twist something (theme i-), such as a rock in building a stone wall, a loose floor board, etc.
Ikellob'u nan batu ta mapto' hi un adi umīwi.
I will turn the rock to see if it will not move.