Usage and meaning of "fall through"

[Mickey]

English Language Tests, Intermediate level

ESL/EFL Test #176 "Phrasal idioms with the verb 'fall'", question 8

A recent survey showed that one in three house hunters have had a property purchase ..........

(a) fall through
(b) fall behind
(c) fall back on
(d) fall out with

English Language Tests, Intermediate level

ESL/EFL Test #176 "Phrasal idioms with the verb 'fall'", answer 8

A recent survey showed that one in three house hunters have had a property purchase fall through.

Correct answer: (a) fall through

Your answer was: correct
_________________________

why use "fall through" in this sentence?

[Mister Micawber]

Fall through = fail to succeed (of an agreement, plan, etc).
_________________
Native English teacher at Mister Micawber's