This is the 13717th most frequent Turkish word.
köşeyi
"The corner" (accusative form of "köşe").
Here, 'köşeyi' refers to a specific corner that is part of the street or road mentioned.
O köşeyi dönünce marketi göreceksiniz.
You will see the store when you turn that corner.
In this sentence, 'köşeyi' metaphorically does not refer to a literal corner, but to achieving a strategic advantage or a goal.
Köşeyi kazandıktan sonra eve geri döndük.
After winning the corner, we returned home.
Here, 'köşeyi' indicates a part of a physical space, specifically a corner in a room or structure where painting is done.