This is the 4767th most frequent Polish word.
oby
"Oby" is a Polish word meaning "if only" or "let's hope."
In this context, 'oby' provides an expression of hopeful anticipation related to a specific condition.
Chciałbym, abyś dotarł na czas, oby tak było.
I would like you to arrive on time; I hope that's the case.
Here, 'oby' expresses a wish or hope.
Oby wszystko poszło dobrze!
I hope everything goes well!
In this usage, 'oby' conveys a hypothetical wish.