The Chinese word 出没 (chūmò) is a verb-object compound formed by combining two contrasting verbs: 出 (chū), meaning "to exit" or "to appear", and 没 (mò), meaning "to submerge" or "to disappear". This structure creates a new binomial or reversible compound where the two opposing actions are juxtaposed to convey a single, nuanced meaning: the action of appearing and disappearing unpredictably, often used to describe the movement of creatures, vehicles, or phenomena that are intermittently visible, as in "haunt", "frequent", or "infest" an area.