言ったもん勝ち
Idiom- 1the person who speaks up wins ; the one who states their opinion first has the advantage Translated by Jiyomi
Other writings and readings
言った者勝ち言ったもの勝ちいったもん勝ち言ったもんがちいったものがち
expressions (phrases, clauses, etc.)
JMdict entry 2870432. Source and licence.