People who work together on the same team, whether in sports, projects, or group activities.
From 'team' (Old English 'team,' originally a sequence of draft animals pulling together) + 'mate' (from Middle Low German 'mate,' meaning messmate or friend). Both words emphasize coordination.
The original 'team' was literally oxen or horses hitched together—so when you're a 'teammate,' you're metaphorically in harness with someone, which is why team sports capture something ancient about human cooperation.
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