állítaniuk
"állítaniuk" is a Hungarian verb form. It is the third-person plural conditional mood, definite conjugation of the verb "állítani". The base verb "állítani" has several meanings, including "to set", "to place", "to erect", "to claim", "to state", and "to adjust". The "-niuk" ending indicates that the subject is plural ("they") and that the action is directed towards a definite object.
Therefore, "állítaniuk" translates to "they would have to set it", "they would have to place it", "they