senior high school
US /ˌsiː.njər ˈhaɪ skuːl/
UK /ˌsiː.njər ˈhaɪ skuːl/

1.
bovenbouw middelbare school, hogere middelbare school
a high school for students in the higher grades, typically grades 10-12 or 11-12, preparing them for higher education or vocational training
:
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My brother is currently attending senior high school.
Mijn broer zit momenteel op de bovenbouw van de middelbare school.
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After graduating from senior high school, she plans to go to university.
Na haar afstuderen van de bovenbouw van de middelbare school, is ze van plan om naar de universiteit te gaan.