He was afraid of letting down his parents, so he studied hard to get into university.

他很害怕让他的父母失望，所以努力学习考上了大学。

youdao

I have a dread of letting down Ray's contributors, who are expecting to see their work in his magazine.

我很害怕自己会让雷的撰稿人们失望，他们都希望看到自己的作品出现在他的杂志上。

youdao

It hurts me deeply to see people fail to cultivate! Aren't you letting down the vows you made upon first leaving home?

我见到不修行的人，觉得非常痛心，这岂不是辜负自己当初出家时所发的愿吗？

youdao

"It's really standing firm and not letting those kinds of questions get you down because they are going to come."

VOA: standard.2010.02.25

And, yes, it is a form of letting down your teammates and the fans.

FORBES: Should Barry Bonds Be in the Hall of Fame? Do Top Performers Get a Pass on Integrity?

But that movie, which took so long to get made, ended up letting down legions of fans.

FORBES: Connect

The HSE's principal inspector for the West, said some sites were letting down the rest of the industry.

BBC: England