The Chinese word "出入" is formed by combining the two characters "出" (to exit) and "入" (to enter), which are antonyms representing opposite directions of movement. This pairing creates a compound word through the conceptual blending of these contrary actions, resulting in a meaning that encompasses both coming and going, often referring to general passage or traffic in and out of a place. The formation inherently relies on the semantic tension between the components, which allows the word to later develop extended senses, such as indicating a discrepancy or difference, derived from the idea of mismatched entries and exits. Thus, its construction is a straightforward yet effective example of how Chinese compounds can integrate opposing ideas to generate nuanced, holistic meanings.