Source: inc.com

Even reputable websites have been caught screwing up these idioms, which spell check often doesn’t find.

When you hear someone using grammar incorrectly do you make an assumption about his or her intelligence or education? There’s no doubt that words are powerful things that can leave a lasting impression on those with whom you interact. In fact, using an idiom incorrectly or screwing up your grammar is akin to walking into a meeting with messy hair. That’s according to Byron Reese, CEO of the venture-backed internet startup Knowingly. The company recently launched Correctica, a tool that scans websites looking for errors that spell checkers miss. And the business world is no exception. “When I look for these errors on LinkedIn profiles, they’re all over the place–tens of thousands,” he says.