For a foreign substance (actor -um- & inst), as a hairy thorn, būdu; dust, hūpu'; ashes, dapul, to irritate an eye (patient -on) by lodging in it.
mamūta
Nalīgat un mabūtay mata ti mid tigon hi owon.
It's difficult if the eye is irritated (by a foreign substance) because one can't see the way.
For someone, as a child playing in dust (actor -um-) to cause an eye (patient -on) to be irritated with a foreign substance.
By ellipsis, a person may be irritated with a foreign substance.
Tigom han ung'ungnga an inodnānay dapul ti butāona han ibbāna.
Watch the child who is holding ashes because he might cause (the eyes of) his companion to be irritated.