1
first person to say something;first person to suggest something;person who raised a matter
See also:
言い出しべ (いいだしべ)
結局、言い出しっぺの人が来てないんだけど、どういうこと？
He brought it up first, but he didn't show up. What's going on?
Other forms
言いだしっぺ 【いいだしっぺ】 · 言い出しっ屁 【いいだしっぺ】 (search-only kanji form) · 言出しっぺ 【いいだしっぺ】 (search-only kanji form) · 言出しっ屁 【いいだしっぺ】 (search-only kanji form)