your face falls

face falls

One's expression suddenly looks disappointed or disheartened, especially after being very hopeful or optimistic before. My face fell when I saw that the meal I'd spent all day preparing had burned in the oven. I could see their faces fall when I told them how much it would cost to process the application.
See also: face, fall
Farlex Dictionary of Idioms.

your face ˈfalls

you suddenly look disappointed or upset: He was quite cheerful until we told him the price. Then his face fell.
See also: face, fall
Farlex Partner Idioms Dictionary
See also:
  • face falls
  • disappointed at
  • disappointed at (someone or something)
  • disappointed in (someone or something)
  • sank
  • your heart sinks into your boots
  • (one's) heart sinks into (one's) boots
  • keep (one's) pecker up
  • keep your pecker up
  • pecker