summer school
US /ˈsʌm.ər ˌskuːl/
UK /ˈsʌm.ər ˌskuːl/
1.
a school that is held during the summer vacation, typically offering remedial or advanced courses, or recreational activities
:
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My son is attending summer school to catch up on his math.
•
She spent her entire summer school break studying for the exams.