Learn what "i don't know how to repay you" means, when people say it, and how to use it naturally in English.

It means the speaker is deeply grateful and feels unable to fully return the favor.
From Married To A Stranger, Episode 2
The speaker is thanking someone but feels they owe them something in return.
Use this when someone helps you in a big way and you want to show sincere appreciation. It can sound warm and heartfelt in personal conversation.
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