おん
favour; favor; obligation; debt of gratitude
JLPT N3 Common word
Noun
恩おんをあだで返かえすな。
Don't replace kindness with evil.
お前まえは恩おんを仇あだで返かえしたな。
You bit the hand that fed you.
猫ねこは三年さんねんの恩おんを三さん日ひで忘わすれる、犬いぬは三さん日ひ飼かえば三年さんねん恩おんを忘わすれぬ。
A cat will forget three years of kindness in three days, feed a dog for three days and he will remember it for three years.