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Horse's Straight Mouth I Pop Quiz Today Directly

Idiom Straight from the Horse's Mouth
Example I got it straight from the horse's mouth that there's going to be a pop quiz today.
Meaning directly from the person or place that is the most reliable source or the best authority
Origin If you want to know the age of a horse, you should examine the size and shape of its teeth. Someone trying to sell you a horse may say it's young, but if you get your information "straight from the horse's mouth," you should know for sure. This expression is relatively modern, dating only from the 1920s.

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