Dictionary / Vocabulary / 恩
おん
favour; favor; obligation; debt of gratitude
JLPT N3 common word
お前は恩を仇で返したな。
You bit the hand that fed you.
猫は三年の恩を三日で忘れる、犬は三日飼えば三年恩を忘れぬ。
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.
恩をあだで返すな。
Don't replace kindness with evil.