When making commitments, it's best to under-promise and over-deliver.

做出承诺的时候，最好留有余地，然后出色完成。

youdao

Always under-promise and over-deliver. Instead of making a promise with your words, simply be there when people need you, and exceed their expectations with your actions.

言出必行，与其用语言许下承诺，不如在别人需要你的时候出现，然后用行动达到他们的期望吧。

youdao

So it's just half of the equation and what these self-help books and messages do is over promise and under deliver, which at times can be destructive.

所以这些心理自助书籍和信息只是等式的一半，而且往往言过其实，达不到预期效果，甚至有时会造成毁灭性的后果。

youdao

Apple tends to under-promise and over-deliver (UPOD) on guidance, so its outlook should always be taken with a grain of salt.

FORBES: Apple Earnings: The Mother of All Reports

On the other hand, the company is known to under-promise and over-deliver.

FORBES: 40 Billion Reasons To Still Love Apple, But Only 1 Really Matters

On the other hand, Apple is known to under-promise and over-deliver.

FORBES: Apple Is Still Apple, But Street Sees Orange