This is the 12926th most frequent Turkish word.
kahvaltıda
"At breakfast."
In this case, 'kahvaltıda' is used to indicate the activity context or occasion when the action took place.
Hafta sonu kahvaltıda ailemle oturup sohbet ettik.
On the weekend, we sat and chatted with my family at breakfast.
Here, 'kahvaltıda' is used in a question to inquire about an action during breakfast time.
Kahvaltıda ne hazırlıyorsun?
What are you preparing for breakfast?
Here, 'kahvaltıda' indicates the time or event during which the action occurs, meaning 'at breakfast'.