This is the 13529th most frequent Turkish word.
koşmak
"Koşmak" means "to run" in English.
In this sentence, "koşar" is the third person singular present tense form of the verb "koşmak," which means to run.
Ahmet sabahları parkta koşar.
Ahmet runs in the park in the mornings.
In this sentence, "koşuyordu" is used metaphorically to describe the car moving very fast, likened to running.
Araba çok hızlı olduğu için uçak gibi koşuyordu.
The car was speeding like an airplane because it was very fast.
Here, "koşmak" is used metaphorically to signify working very hard or being in a rush to achieve something.