Tawriyah, also called īhām, employs a word with two possible senses: a near or obvious sense and a more remote sense intended by the speaker.
The audience initially inclines toward the near meaning, but the context leads to the remote meaning. The mere existence of polysemy is not sufficient: the evident meaning must differ from the intended one.
If the setting allows only one plausible meaning, there is no effective tawriyah.