Learn Turkish: Kedi aniden çekmeceden fırlayıverdi. - The cat suddenly darted out of the drawer.

It is built from the verb root fırla (to dart or jump out). Since the root ends in a vowel, we add the buffer letter -y- before the suddenness suffix -ıver. Finally, the past tense suffix -di is added to mean it darted. The -(y)ıver structure shows that the action happened very quickly or unexpectedly.

If the suffix -(y)ıver already implies suddenness, why is the word aniden (suddenly) also used?

While -(y)ıver does add a sense of suddenness or speed on its own, pairing it with an adverb like aniden is very common in Turkish. It acts as an intensifier, emphasizing exactly how unexpected and abrupt the cat's jump was.

Why does the suffix take the form -ıver here instead of -iver?

The first vowel in the suddenness suffix follows 4-way vowel harmony (-i, -ı, -u, or -ü). Because the last vowel in the root fırla is a, the suffix takes the undotted ı. The second part of the suffix (-ver) is frozen and never changes its vowel to match the root.

Why does çekmece (drawer) take the -den ending?