let down
Beginner (A2)neutral
To make someone sad or disappointed by not doing what you promised, or to move something slowly downward.
"I promised I'd be there, and I don't want to let you down."
Hear it in context

1 Hour of ‘The Big Bang Theory’ to Help You Decompress From People
The Big Bang Theory · 37:02
Let down?

How to Use “Let Down” in American English 😔
Rachel's English · 0:00
let down.

How to Sell Your Startup | My First Million
My First Million Clips Official · 6:57
massive let down.

The Rolls-Royce is worse than we thought...
Garbage Time · 7:54
Well, massive let down.

What Baldur's Gate 3 is Like For Someone Who Doesn't Really Play Games
Razbuten · 14:18
Lady: What a let down.