To look at carefully so as to understand the meaning of (something written, printed, etc.)
This base sign is a verb that can be inflected for different meanings.
Gloss: /\YOUR BOOK/\ IX-me FINISH READ+++, [intj] VERY-GOOD[nod]
English equivalent: I've been reading your book. It's very good.
The intonation of the interjection (like "HEY") is a way of getting listener's attention. The gloss [nod] is an example of assertion.