JMdict: 2102680

恩を売る 【おんをうる】

  1. [exp,v5r] to demand gratitude; to do something for someone in order to create an obligation of gratitude from that person
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Kanji in this word:

Kanji Meanings On Readings Kun Readings
Grace, Kindness, Goodness, Favor, Mercy, Blessing, Benefit オン
Sell バイ う.る, う.れる