This is the 1663rd most frequent Arabic word.
بعين
"بعين" means "with an eye" or "in view."
Here, بعيني refers to seeing directly with one's own eyes as a means of emphasizing personal witness.
رأيت الحادث بعيني.
I saw the accident with my own eyes.
Here, بعين metaphorically conveys the perspective or viewpoint of an observer.
أتابع الموضوع بعين المراقب.
I follow the matter with the eye of an observer.
Here, بعين represents a metaphorical viewpoint or attitude towards the problem, namely, optimistic.