Chinese phrase
感激不尽 gǎn jī bú jìn
Meaning
be endlessly grateful
When to use it
Shows very deep gratitude for someone's help. It is a strong, polite expression used when someone has been especially helpful.
Example dialogue
你今天帮我照顾孩子一整天，感激不尽。 nǐ jīn tiān bāng wǒ zhào gù hái zi yì zhěng tiān gǎn jī bú jìn
You looked after my child all day today, and I am endlessly grateful.
别客气，我也很乐意帮忙。 bié kè qì wǒ yě hěn lè yì bāng máng
Don't mention it; I was glad to help, too.