The phrase is believed to have originated from the practice of determining a horse's age by examining its teeth, which can only be done by directly inspecting the horse.
The phrase is used when someone wants to emphasize that the information they are providing comes directly from the most authoritative source, rather than from secondary or hearsay sources.
Context matters in English because the meaning of words can vary based on the surrounding words, phrases, or situation. Words often have multiple meanings, and the intended sense becomes clear through the context in which they are used.
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