The word chéng jī literally combines chéng (to ride, to take advantage of) and jī (opportunity, chance — originally meaning 'mechanism' or 'key moment'). Together, it means 'to seize an opportunity' — not in the physical sense of boarding a plane, but figuratively, acting promptly when conditions are favorable. It implies quick, strategic action rather than passive waiting.

This verb is commonly used in both spoken and written Chinese, especially in contexts involving negotiation, personal advancement, problem-solving, or timely intervention. It often appears with subjects like people, organizations, or governments taking initiative — for example, lowering prices to attract customers, launching a campaign during a holiday season, or resolving a conflict before it escalates. While neutral in register, it carries a slightly positive or pragmatic connotation, suggesting shrewdness and awareness.