Let’s pretend your coworker surprised you with your favorite Starbucks drink during work. How do you feel about her? Most likely, she is now on your good side. Germans might even say you now have a Stein im Brett with her (literally translated: a “stone in the board”).
In German, if someone has a Stein im Brett with you, it means that person now has your sympathy. In other words, that person did something to win you over. But to understand where this phrase came from, we will have to take a close look at the origins of this strange German saying.