The word "tune-up" is a noun that refers to adjustments made to an engine, usually in a car, to improve its performance. It can also mean preparing someone or something for a demanding activity, like exercising before a big event.
You can use "tune-up" when talking about cars or when discussing getting ready for something important, like a sports event or a performance.
In a more advanced context, "tune-up" can also refer to refining skills or abilities. For example, "She did a tune-up of her presentation skills before the big meeting."
While there are no direct idioms that use "tune-up," you can use the phrase "tune up one's skills," which means to improve or practice skills in preparation for a task.
In summary, "tune-up" is a useful word that you can use in both everyday conversations about cars and in contexts where preparation and improvement are key.