An implied or covert hint of blame. It is a law term, meaning the person nodded to or indirectly referred to (Latin, in-nuo).
“Implying or suggesting, instead of stating plainly, often increases the effect of what is intended to give pain or pleasure. This is ‘innuendo.ʹ”—Bain: Composition, etc. (Innuendo), part i. p. 212.