Pull out all the stops

To “pull out all the stops” means to make a great effort to achieve something. If you need to apologize for something really bad or really serious, then “pull out all the stops” and use all six. Using all six ingredients to a sincere apology reflects making a great effort to apologize, or reflects “pulling out all the stops.” The director of the film “pulled out all the stops” to meet the fast-approaching deadline, or did everything he could to meet the deadline.