协办 means 'to co-host' or 'to assist in organizing' an event, activity, or project. It combines 协 (xié), meaning 'to cooperate' or 'jointly', and 办 (bàn), meaning 'to handle', 'to manage', or 'to organize'. Together, they convey the idea of working together to carry out a task—especially formal or institutional arrangements such as conferences, exhibitions, competitions, or public services.

This verb is commonly used in official, organizational, or administrative contexts—for example, when government departments, schools, companies, or NGOs jointly plan and execute an initiative. It implies shared responsibility and active participation, not just passive support. 协办 often appears in written announcements, news reports, and formal documents, and is rarely used in casual speech. The subject is typically an organization or institution, and the object is usually an event or project.