堰を切ったよう
Meanings
1
gushing forth; bursting out; like breaking a dam
Idiomatic expression describing something that suddenly flows or bursts out in large amounts, like water from a broken dam. Often used for emotions, words, tears, or crowds. The literal image is of a dam breaking.
She burst into tears as if a dam had broken.
The spectators poured into the stadium like a flood.