A young male horse, usually under four years old, or a term for a young or inexperienced person.
From Old English 'colt,' possibly from Old Norse 'kolt.' Early origins unclear, but it's been used for young horses since Anglo-Saxon times.
A colt's bones don't fully harden until age four, which is why you can't ride them seriously until they're mature—and why 'colt' came to mean any young, untested person.
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