1800, from outside; figurative sense of "a person isolated from conventional society" is first recorded 1907. The sense of race horses "outside" the favorites is from 1836; hence outside chance (1909).
权威例句
1. An outsider might misconstrue the nature of the relationship.
外人也许会误解这种关系的本质。
2. Malone, a cop, felt as much an outsider as any of them.