What does it mean to hold back or to keep under control?

To hold back or keep under control means to restrain one's emotions, impulses, or actions in order to maintain composure or adhere to social norms. This can involve suppressing feelings like anger or excitement to respond appropriately in a given situation. It often reflects a conscious choice to prioritize rational thinking or social expectations over immediate instincts. Ultimately, it is about finding balance and exercising self-discipline.