Considering that the prime meaning of umm is the source...
Considering that the prime meaning of umm is the source, referent, and refuge of objects, the term umm al-kitāb means that the referent (to understand) mutashābih verses are the muhkam ones. In this verse, muhkam and mutashābih are opposites. Then, the verse speaks of people whose hearts have been afflicted with doubt and deviation from Truth and follow mutashābih verses because they seek discord and ‘interpretation’.
This shows that a mutashābih verse is one the meaning and intent of which cannot be understood by just listening to it; rather, there is doubt between various meanings until muhkam verses are referred to and its meaning is made clear. Hence, a mutashābih verse becomes muhkam by muhkam verses however a muhkam verse is muhkam in and of itself.
When we refer the abrogated verse to the abrogative one we realize that the abrogated verse comprised a precept that was only applicable until the nāsikh was revealed.[^6] Mutashābih verses indicate a specific intent A person who carefully studies the whole Qur’an will without doubt not even find one verse lacking signification and explanation. There is no verse that does not indicate its signification.
This signification may either be a single one that a person who is familiar with the discourse will understand or several which may be mistaken with each other.