Why do people say, "Don't look... | Almanac.com

Why do people say, "Don't look...

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Why do people say, “Don’t look a gift horse in the mouth”?
The saying, which generally means “Don’t be ungrateful,” seems to stem from the practice of giving horses as gifts. To check the age of a horse, you normally look into its mouth. This would be considered quite rude if the horse was being given to you as a gift.