rain something off
phrasal verb with rain verb [ I ] uk/reɪn/ us/reɪn/
UK (US rain something out)
因下雨而停止;因雨取消（或中断）
If an event is rained off, it cannot start or continue because it is raining.
His hockey match was rained off. 他参加的曲棍球比赛因雨取消。