This is the 581st most frequent Turkish word.
sonuna
"Sonuna" means "to the end" in English.
Here, 'sonuna' means 'to the end', referring to the conclusion of the walking activity.
Yürüyüşün sonuna geldik.
We have reached the end of the walk.
In this case, 'sonuna' indicates a specific point in time, namely the conclusion of the current month, as a temporal reference.
Kampanya ayın sonuna kadar devam edecek.
The campaign will continue until the end of the month.
Here, 'sonuna' refers to the conclusion or the last part of the book, as a spatial reference.