This is the 163rd most frequent Persian word.
رو
The Persian word "رو" can mean "face," "surface," or "on," depending on the context.
In this sentence, 'رو' is used as a preposition meaning 'over.'
خورشید رو پشت کوه دیدم.
I saw the sun over the mountain.
In this sentence, 'رو' indicates the action of placing on a surface, expressing 'on.'
کتاب رو روی میز گذاشتم.
I placed the book on the table.
Here, 'رو' is used as a direct object marker, referring to the person met.