Going in is a phrase used to describe the act of entering a place or situation. It is often used to refer to the beginning of a journey, such as when someone is 'going in' to a new job or starting a new project. It can also be used to describe the process of becoming involved in something, such as when someone is 'going in' on a business venture with a partner. In general, going in is a phrase that is used to describe the act of taking the first step towards something.