What does it mean to 'rebuff' someone?

To 'rebuff' someone means to reject their advances, suggestions, or offers, particularly in a blunt or abrupt manner. The term conveys a sense of dismissiveness or refusal that is direct and possibly harsh, implying that the person is not only turning down the approach but doing so without any nuance or politeness. This aligns perfectly with the definition embodied in the correct choice.

In contrast, the other options suggest actions that involve some form of acceptance, encouragement, or polite communication, which are distinctly different from the notion of rebuffing. The verb's connotation emphasizes the act of pushing away or denying rather than opening a dialogue or showing receptiveness. Thus, the essence of 'rebuff' fundamentally captures the idea of a firm and often unsympathetic rejection.