いいだしっぺ
first person to say something; first person to suggest something; person who raised a matter
Also written 言いだしっぺ、言い出しっ屁、言出しっぺ、言出しっ屁
Noun
結局けっきょく、言いい出だしっぺの人ひとが来らいてないんだけど、どういうこと？
He brought it up first, but he didn't show up. What's going on?