Learn Turkish: Reyondaki kadınlar çılgınca itişiyordu. - The women in the aisle were pushing each other wildly.

The base verb is itmek (to push). By adding the reciprocal suffix -iş, we get itişmek, which means "to push each other" or "to shove one another." This suffix is commonly used to show actions done mutually by multiple people, which fits perfectly with the chaotic scene described!

What is the function of -ca in çılgınca?

The suffix -ce or -ca often turns an adjective or noun into an adverb of manner. Here, it attaches to the adjective çılgın (crazy/wild) to create çılgınca, meaning "wildly" or "in a crazy manner."

Why do we need -ki in Reyondaki kadınlar? Couldn't we just say Reyonda kadınlar?

The suffix -ki turns the locative phrase reyonda (in the aisle) into an adjective that links directly to a noun. Reyondaki kadınlar specifically means "The women [who were] in the aisle." If you just said Reyonda kadınlar çılgınca itişiyordu, it would feel more like a general statement of location: "In the aisle, women were pushing each other wildly."

Since kadınlar is plural, why isn't the verb pluralized as itişiyorlardı?