ㄅㄢˇbǎnㄕㄤˋshàngㄉㄧㄥˋdìngㄉㄧㄥdīng

  1. 比喻事情定局不容改變這次出國板上釘釘。」

that clinches it, that's final, no two ways about it
normal sein (V)​