People who do not belong to a particular group or community, often viewed as different or excluded. Can also refer to competitors with little chance of winning.
From 'outside' plus agentive suffix '-er' and plural '-s.' The social sense developed in the 19th century, while the betting/racing sense (long shot) emerged from horse racing terminology in the early 1800s.
Outsiders often become the most valuable members of groups precisely because their different perspective helps solve problems that insiders can't see. Research shows that diverse teams with 'outsiders' consistently outperform homogeneous groups, turning social exclusion into cognitive advantage!
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