let down
🇺🇸
/lɛt daʊn/
🇬🇧
/let daun/
to fail to meet someone's expectations or not do what you promised
I don't want to let down my friend by not showing up for her birthday.
친구의 생일에 나타나지 않음으로써 친구를 실망시키고 싶지 않습니다.