This is the 10196th most frequent Turkish word.
başımıza
"Başımıza" means "to/onto/over our head" or "upon us" in English.
Here, 'başımıza' means 'to us' in the sense of 'to our situation' or 'affecting us directly.'
Bu olay başımıza gelen en kötü şeydi.
This event was the worst thing that happened to us.
In this context, 'başımıza' implies 'upon us,' indicating responsibility or assignment directed towards the group or individual.
Yeni bir görev başımıza verildi.
A new task has been assigned to us.
Here, 'başımıza' signifies 'happened to us,' directly affecting the speaker or the group.