grace, kindness, goodness, favor, mercy, blessing, benefit
恩 centers on a deep, benevolent kindness that comes from someone else: grace, favor, mercy, or a blessing that benefits the receiver.
恩 combines 因 (cause, reason) and 心 (heart), suggesting a heartfelt reason or a kindness that comes from the heart. The exact historical development is uncertain, but the component relationship is well established.
The top part 因 looks like a person enclosed, and the bottom 心 is the heart. Picture someone trapped in a difficult situation, and another person's heart reaches out to help—that's grace and kindness.
For オン, imagine receiving a great kindness that feels like being switched 'on' to a warm, glowing light: on -> オン, and the favor lights up your heart.
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favour; favor; obligation; debt of gratitude
grace; favor; favour; blessing; benefit
paying back a favour; repayment (of an obligation, kindness, etc.)
amnesty; pardon
benefactor; patron; person to whom one owes a great deal; person to whom one is (deeply) indebted
teacher (to whom one owes a debt of gratitude); mentor; one's former teacher
obligation; favour; favor; debt of gratitude
grace; favour; favor
Imperial gift
(expression of) gratitude
repaying a kindness; gratitude
ungrateful
reward
pension (esp. public servant's)
favour; favor; patronage
favour; favor; act of grace; special privilege
land received in compensation for one's service; land given by a lord to a vassal for his service
Grace Abounding (autobiography by John Bunyan)
(received) favor, kindness or blessing (favour)
the favor (favour) of one's master