to  throw  a (monkey) wrench  into the works
throw
θrəʊ
threw
a
ə
ē
(monkey)
mʌnki
manki
wrench
rɛnʧ
rench
<abbr style="text-decoration: underline;" title="into / in" > into</abbr>
ɪntu
intoo
the
ðə
dhē
works
wɜ:ks
vēks

Definition & Meaning of "throw a (monkey) wrench into the works"in English

to throw a (monkey) wrench into the works
01

to slow down a plan or activity or prevent it from going on 

to [throw] a (monkey|) wrench (into|in) the works definition and meaning
Idiom
Informal

What is the origin of the idiom "rain on someone's parade" and when to use it?

The idiom "rain on someone's parade" originates from the notion of a sudden downpour spoiling an outdoor celebration or event. It is used figuratively to describe the act of spoiling someone's happiness, excitement, or plans by delivering unwelcome news, criticism, or negativity.

Examples
The sudden rule change threw a wrench into the works. 
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