خذ هذا الفرس
Take this horse.
Suppose someone says this while pointing to a book. “Faras” conventionally denotes a horse, while the gesture points to the book. Nonliteral reference plus an external indication should not, by themselves, be sufficient to call the expression a rhetorical trope.
Intention and error must be distinguished. If the speaker meant to say “book” and accidentally uttered “horse,” the expression is a slip, not a successful figurative transfer.