The phrase "childhood dream come true" is used to describe a situation where something a person has longed for or desired since their childhood finally becomes a reality. It doesn't necessarily mean that the dream is coming true while the person is still a child. Instead, it refers to the fulfillment of a dream that originated during their childhood.
For example, imagine someone always dreamed of becoming a successful musician from a very young age. They spent their childhood playing instruments, writing songs, and imagining a future where they would be performing on big stages. If, as an adult, they finally achieve their goal of becoming a successful musician, they might say, "My childhood dream has come true," even though the achievement occurred in adulthood.
The term emphasizes the significance and long-lasting impact of dreams and aspirations that have been with a person since their formative years. It acknowledges the power of childhood dreams to shape one's life trajectory and influence their actions and choices in adulthood. Achieving a childhood dream can be especially meaningful because it represents the fulfillment of a passion or ambition that has been cherished for a considerable part of one's life.
In summary, "childhood dream come true" is an expression used to describe the realization of a dream or goal that has been nurtured and cherished since childhood, regardless of when the actual achievement occurs in life.