The word "驳回" is formed through the conceptual combination of two actions: "驳" (bó), meaning to refute, argue against, or reject the validity of something, and "回" (huí), meaning to return or send back. When merged, they create a single, coherent idea where a submission (like a request, appeal, or claim) is not merely rejected but is actively refuted and formally sent back to its originator, completing a full cycle of denial. It is a figurative and efficient compound where the second character reinforces and specifies the directional outcome of the first.