This is the 6810th most frequent Russian word.
za
The Russian word "за" can mean "behind," "beyond," "for," or "in favor of," depending on the context.
Here, 'за' is used to express gratitude for something.
Я благодарен тебе за помощь.
I am grateful to you for the help.
Here, 'за' indicates a location beyond a certain boundary.
Птица улетела за горизонт.
The bird flew beyond the horizon.
Here, 'за' conveys an amount of time in which an action was completed.