What does "fall flat" mean?

To produce no humour, inspiration, etc.

What is a synonym for "fall flat"?

Common synonyms include: bomb, break down, capsize, careen, collapse, come a cropper.

verb

verb ·Uncommon ·Advanced level

Verb

1
To produce no humour, inspiration, etc.
"The prop comedy in Las Vegas fell flat."
2
fail utterly; collapse wordnet

"The prop comedy in Las Vegas fell flat."