means getting information directly from the source, without any distortion or misinterpretation.
the idiom has its origin in the world of horse racing, where the horses’ mouths would be checked after a race to see if they had been chewing on anything that would give them an unfair advantage.
The politician’s speech was straight from the horse’s mouth, so we can be sure that it was accurate.
The reporter got the story straight from the horse’s mouth, so we can be sure that it is true.
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