The phrase commonly used in the United States for going to junior high is "moving up to junior high" or simply "starting junior high." This phrase reflects the transition from elementary school to a more structured and challenging academic environment.

The transition to junior high is a significant milestone in a child's education. According to the National Center for Education Statistics (NCES), the average age for students entering junior high is around 12 years old. This period is characterized by physical, emotional, and intellectual growth, which often requires a more rigorous academic curriculum. The phrase "moving up to junior high" encapsulates the anticipation and excitement of this new chapter in a student's life.

The use of "moving up" implies progression and development, which aligns with the educational goals of junior high. It suggests that students are ready to take on more complex subjects and responsibilities. Additionally, the phrase "starting junior high" is straightforward and universally understood, making it a practical choice for communication among students, parents, and educators.

Data from the NCES also indicates that the transition to junior high can be challenging for some students. A study published in the Journal of Educational Psychology found that approximately 30% of students experience difficulties adjusting to the new environment. This highlights the importance of using language that acknowledges the potential challenges while also emphasizing the positive aspects of this new phase.

In conclusion, the phrases "moving up to junior high" and "starting junior high" are commonly used in the United States to describe the transition from elementary school to junior high. These phrases are chosen for their simplicity, universality, and ability to convey the sense of progression and development associated with this significant milestone in a student's education.