This is the 564th most frequent Turkish word.
bugüne
"Bugüne" means "to this day" or "until today" in English.
In this sentence, "bugüne" refers to the time up to the present day, used to mark the endpoint in the context of efforts.
Bugüne kadar çok çalıştık.
We have worked hard up to today.
Here, "bugüne" signifies exclusivity for the current day, showing a one-day offer.
Bugüne özel bir indirim var.
There is a special discount for today.
"Bugüne" in this sentence is used to propose something for the present day's activities.