Young male horses, typically under four years of age, or members of a sports team named after such animals.
From Old English colt, possibly related to Swedish kult meaning 'young boar'. The word originally applied to young animals generally, then specialized to young horses, particularly males, while maintaining broader metaphorical uses for youthful energy.
The Indianapolis Colts football team name reflects the historical association between colts and spirited, energetic performance, though ironically, young horses were traditionally considered too unpredictable for serious work. Many languages have similar words for young male horses that also metaphorically suggest wildness or untamed energy.
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