宣布 (xuān bù) is a transitive verb meaning 'to announce'—especially in formal, official, or public contexts. The first character 宣 (xuān) means 'to proclaim' or 'to declare', often with authority or ceremony; the second character 布 (bù) means 'to spread' or 'to make known'. Together, they emphasize the act of formally communicating information to a wider audience, such as an organization, institution, or the public. It’s commonly used for announcements by governments, schools, companies, or event organizers.

This verb typically takes a direct object (e.g., a decision, result, policy, or schedule) and often appears with time or agent markers like 'by the government', 'at the press conference', or 'tomorrow'. It carries a neutral-to-formal register and is rarely used for casual, personal news (e.g., you wouldn’t say 我宣布我饿了 — that would sound comically overblown). Instead, it implies intentionality, legitimacy, and broad dissemination.