This article examines the chapter on īhām (literary amphiboly) in Ḥadāʾiq al-Siḥr by Rashīd Vaṭvāṭ (d. 1182). Ḥadāʾiq, a treatise on stylistics with Persian and Arabic examples, is the oldest extant document to define īhām. Vaṭvāṭ's definition of īhām sheds light on the mechanism and function of this literary technique. This article argues that īhām, according to Vaṭvāṭ, operates through the creation of semantic fields and defamiliarization. Previous scholars who examined this chapter of Ḥadāʾiq, oblivious to this point, have made a number of misinterpretations. However, by analyzing the name he prefers for this figure of speech, the definition he gives, and the examples he cites to explain it, this article demonstrates that Vaṭvāṭ had this function of defamiliarization in mind.