洪こう恩おん

noun

great debt of gratitude; immense obligation

Formal, somewhat literary term for a profound favor or kindness that one can never fully repay. Often used in expressions of deep gratitude, such as in letters or speeches. Compare with 大恩 (たいおん), which is more common.

See also: 大恩

• 先せん生せいの洪こう恩おんに報むくいることは到とう底ていできません。

  I can never repay the great kindness of my teacher.

• このたびの洪こう恩おん、一いっ生しょう忘わすれません。

  I will never forget this immense favor for the rest of my life.