«فهو ما إذا كان اللفظ غير مكشوف المراد فكشفه ببيانه»
Tafsir occurs when the intended referent of an expression is not disclosed and is then made clear through a further statement.
The initial words communicate that something is being asserted or acknowledged, yet the precise object or quantity remains obscure. Interpretation supplies the missing identification needed to apply the statement.
Taqrir confirms a meaning that was already apparent. Tafsir discloses a meaning that was not initially evident. The contrast becomes clear in admissions of unspecified property or an unspecified addition to an amount.