parent-teacher association
US /ˌper.əntˈtiː.tʃər əˌsoʊ.siˈeɪ.ʃən/
UK /ˌper.əntˈtiː.tʃər əˌsoʊ.siˈeɪ.ʃən/

1.
an organization of parents and teachers at a school that works to help the school and students
:
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The Parent-Teacher Association organized a fundraiser for new playground equipment.
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She's very active in her children's school Parent-Teacher Association.