This is the 7648th most frequent Chinese word.
辜负
To fail to live up to; to let down; to disappoint.
In this sentence, '辜负' is used to express the notion of not fulfilling someone's expectations.
我不会辜负你的期望。
I will not let down your expectations.
Here, '辜负' conveys the idea of not living up to the trust placed by someone.
他感到很遗憾，因为他辜负了老师的信任。
He felt very regretful because he let down his teacher's trust.
This context uses '辜负' to emphasize the commitment to values such as diligence in response to others' support.