- nominalizer, the one(s) that
- the particular...
Similar to the -ing suffix in English, the -ígíí suffix attached to a verb means "the doing of [verb]", or "the one(s) that does/do the [verb]", "those that are/were the [verb]". Suffixed to a noun, it is often used like a definite article, indicating a particular one.
Thus naaʼnaʼ (“he/she/it crawls about”) + -ígíí ("-ing") produces naa´na´ígíí ("[the act of] crawling about").