floodgates

nounC2

水門、(比喩で)堰を切る勢い

gates controlling water flow, often used for sudden release

例文

Her honest speech opened the floodgates for others to share their stories.

彼女の正直なスピーチが堰を切るきっかけとなり、他の人々も自分の話を語り始めた。