“Can you do me a solid?”
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Doing a solid for someone can be pretty odd if you aren’t from the U.S. Funny enough, it came to mean “favor” around the early ‘60s. Prior to this, “solid” meant something or someone that’s good. In the ‘20s, if you said, “he’s solid,” it would have meant that the guy was good or exemplary. Some suggest that it could have originated from the fact people said, “Do me a solid favor?”