szakértelmüket
Szakértelmüket is a definite-object form of the Hungarian noun phrase szakértelmük, meaning “their expertise.” The base noun szakértelem refers to professional knowledge, skill, or competence. The form szakértelmüket combines the third-person plural possessive suffix -ük with the definite-object suffix -et, and is used when the expertise in question is treated as a definite, known object in the sentence.
In usage, szakértelmüket marks that the subject possesses the expertise in question and that it functions as
Grammatically, szakértelmüket illustrates how Hungarian combines possessive forms with the definite-object suffix in a single noun
See also: szakértelem, magyar grammar on definite objects, possessive suffixes.