ēn shēn sì hǎi
恩德情义极为深重
明 冯梦龙《警世通言》第32卷:“海誓山盟,各无他志。真个恩深似海无底,义重如山义更高。”
恩深似海作谓语、定语;指恩情很深。
One's kindness to somebody has been as vast as the sea.