«وَالإِطْنَابُ: إِمَّا بِالإِيضَاحِ بَعْدَ الإِبْهَامِ»
One form of rhetorical expansion is clarification following an initially indistinct expression.
The first formulation sets up a general or unresolved conception; a later expression identifies the intended meaning. Both stages contribute: the first attracts attention and creates expectation, while the second satisfies that expectation with a determinate meaning.
Here ibhām means a temporary lack of specification that is subsequently resolved, not hopeless obscurity. Its value depends on the apt timing and adequacy of the clarification.