This is the 5518th most frequent Japanese word.
おん
"おん" can mean "favor," "grace," or "debt of gratitude" depending on context.
In this sentence, "恩" (on) refers to a favor or kindness that someone receives from another, often carrying a sense of gratitude and obligation.
彼は私に大きな恩を与えてくれた。
He bestowed a great favor upon me.
Here, "恩" is used to denote a favor or kindness that is remembered and for which repayment is intended.
その人には昔の恩を返すつもりです。
I intend to repay the favor to that person from long ago.
In this context, "恩" signifies a favor or kindness that one acknowledges and expresses gratitude for.