This is the 429th most frequent Turkish word.
düştü
"Fell" or "dropped."
Here, 'düştü' is used metaphorically to describe a decrease in temperature, implying a figurative 'falling' of the temperature measurement.
Hava çok soğudu, sıcaklık sıfırın altına düştü.
The weather became very cold, and the temperature dropped below zero.
In this case, 'düştü' represents a decline in performance, used figuratively to convey a decrease in quality or effectiveness of the team's activities.
Takımımızın performansı bu hafta düştü.
Our team's performance dropped this week.
In this sentence, the word 'düştü' is used to indicate the action of falling, describing that the book physically fell from the table onto the ground.