The switching or exchanging of ilawud (lower or downstream) and ilaya (upper or upstream) usually refers to the "pagpapalit ng pwesto" or simply "palitan" in Filipino terms.But if you mean this in a more cultural or traditional context—like swapping roles or places between people from the ilawud and ilaya areas—there isn’t a specific single term for it in everyday Filipino language[tex].[/tex] It might just be described as “pagpapalit ng lugar” or “pagpalit ng pwesto.”