'Chéng wéi' is a compound verb meaning 'to become' — indicating a change of state, role, identity, or status over time. The first character 成 (chéng) means 'to succeed', 'to accomplish', or 'to complete', while 为 (wéi) means 'to be' or 'to serve as'. Together, they express the process of transitioning into a new condition or identity — for example, becoming a teacher, becoming famous, or becoming part of a group. It's commonly used in both formal and informal contexts, especially when describing personal development, professional advancement, or social transformation.

This verb always takes a noun or noun phrase as its object (e.g., a profession, title, role, or abstract concept), never an adjective. Unlike some stative verbs, 成为 does not describe temporary states but rather completed transitions — it implies that the change has been realized or is expected to be realized. It frequently appears in written Chinese, news reports, biographies, and motivational speech, though it’s also common in everyday spoken Chinese when discussing goals or life changes.