The phrase "main course" refers to the main dish or the primary food item that is served during a meal. It is usually the most substantial or important part of a meal. Full definition
They can be big or small, for main course salads or appetizers. (marksdailyapple.com)
These meals can be eaten separately as main courses or all in one day. (lowcarbediem.com)
It's a terrifying survival game in that the character's only main course of action is to run or hide from the inhabitants of the asylum. (techtimes.com)