Definition
- B2
to fail someone by not fulfilling what you have promised or were anticipated to accomplish
使某人失望；辜負某人
He promised to attend my graduation ceremony, but in the end, he let me down.
他答應要參加我的畢業典禮，但最後卻讓我失望了。
I really don't want to let my parents down, so I will study hard.
我真的不想讓父母失望，所以我要努力學習。
I can’t let my friend down at such an important moment.
我不能在這麼重要的時刻讓朋友失望。