Our Head of Department resigned from his position and left the company about three weeks ago. Nobody has been hired to take over his role yet. This has created a complicated situation in our team, because nobody knows who should be calling the shots (Das Heft in der Hand haben). Hopefully they find a replacement soon!
The origin of the expression is probably from the game of pool or billiards, where a player has to „call the shots“ by announcing which ball will be hit and where it will go.

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My boss called me into her office this morning. She wanted to talk to me about a new project which is very important to our company. Everybody in the department is very excited. My boss wants me to be project leader. It would be an interesting project but it will mean lots of extra time in the office. I have a feeling I’ll be doing overtime until the cows come home (bis zum Abwinken)!
When my former company filed for bankruptcy (Konkurs anmelden), I was really upset. I loved working there and felt a close personal connection to the company. But I have since found a new job with more responsibility and have learnt a lot of things I would never have in my old position. So in the end, I guess every cloud has a silver lining (Wo Schatten ist, ist auch Licht.)
We have a new management trainee in our department – fresh from university. He’s full of enthusiasm, which is great, but I think he forgets that we have been doing this work for years and gathered a lot of valuable experience in that time. When he tried to tell me again last week how I should be doing my job I had to remind him not to teach his grandmother to suck eggs (Da will das Ei wieder klüger sein als die Henne!)
When our CEO retired last year, there were a number of senior managers in our company who really wanted the position. But in the end it went to the dark horse (unbekannter und erfolgreicher Außenseiter), a woman from outside our company who was 15 years younger than any of the other candidates and had no previous experience leading a company.