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Wiktionary
fall through

vb. (context intransitive idiomatic English) To be unsuccessful, abort, come to nothing/naught; to be cancelled; not to proceed.

WordNet
fall through

v. fail utterly; collapse; "The project foundered" [syn: fall flat, founder, flop]

Usage examples of "fall through".

Whether they are hurled dead, or whether they go down living, they fall through to the iron bars, where the water leaps and rejoices to receive them!

And his secret, which he was not ready to share, because it could still fall through.

It was as if she were gazing into an abyss so deep that one could fall through it forever, into eternity.