debtor
debt + -or
https://gyazo.com/b6528a489aa44b1f7f5888bf01fcc753
source: [賭博黙示録カイジの安藤と古畑がカイジの言葉に涙を流すGIF画像|無料GIF画像検索 GIFMAGAZINE 451120]
noun
a person or institution that owes a sum of money.
債務者, 負債者(↔ creditor)