المعنى الاصطلاحي :

The setting and disappearance of something.

الشرح المختصر :

"’Ufool" according to Ahl-us-Sunnah means the fading away and setting of something. The scholastic theologians thought that "’Ufool" means changing and moving. It is a reason for not believing in the lordship of something that sets, because everything that sets is not eligible to be a worshiped deity, such as the sun, the moon and the like. It is an invalid interpretation, so their interpretation can not be approved because the words "taghayyor" (changing), "taharruk" (moving) are from the ambiguous words, the meaning and explanation of which are sought when mentioned.

التعريف اللغوي المختصر :

"’Ufool": absence and concealment; used in connection to the sun (and other celestial bodies) to mean setting. Other meanings: getting screened, disappearing.