Tawjīh places two distinct interpretive possibilities before the hearer. One may amount to praise and another to criticism; one may sound like a blessing and another like a curse.
For illustration, “his door is always open” can praise hospitality in one setting or criticize an inability to secure the house in another. Such a case illustrates the possibility of contrary evaluations, provided both arise plausibly from the expression and its setting.
If the wording or a decisive context fixes only one meaning, the figure’s productive tension disappears.