How to understand the „doubling“ of a word in Quran linguistically?

Selam aleikum, This is a question about the linguistic und rhetoric usage of words in the Quran. In reading the Quran I often come across words, which are repeated twice successively, one time in noun and one time in adjective/adverb. There are some examples, for now there is only two, which comes to my mind: > And ever is the command of Allah a destiny decreed. (33:38 , Saheeh International) Literally: > and God`s order/command was/is a predestiny predestined/estimated. (... qadaran maqdooran ...) Example 2: > and He placed between them a barrier and prohibiting partition. (25:53 , Saheeh International) Literally: > He made/put between them (B) a barrier and (an) obstruction obstructed. (wahijran mahjooran) There were other examples, which I read. I hope you all know, what I mean here. So my question is, how is this understood as a stylistic device in the language of Arabic to double a word? Is this meant as an increase of the intensity of what is meant? And especially in this example of „predestiny predestined“, why twice?