From Longman Dictionary of Contemporary Englishgrade schoolˈgrade ˌschool noun [countable, uncountable] American EnglishSES an elementary school
Examples from the Corpus
grade school• At first it feels like high school, then junior high, and finally grade school.• And they were the ones who taught the next generation from grade school up.• In grade school Gary had served as an altar boy.• In grade school, she wrote them herself and begged people to read her creations.• The local grade school and the high schools and the nearby universities exist.• Many read at only grade school levels.• Every one of these children who has started grade school has finished high school, Phyllis says.• Across the hall, a group of twenty grade school children are at work in two connected rooms. 