«إيراد الكلام محتملاً لوجهين مختلفين»
Presenting an utterance so that it can bear two different interpretations.
Here “different” is not merely a pair of close synonyms: the figure is especially concerned with opposed directions such as praise and blame. The words remain unchanged while the interpretive outcome depends on context and the aspect considered.
Not every vague sentence is tawjīh. Both readings need a meaningful relation to the expression and its rhetorical setting; empty obscurity is not a semantic ornament.