Meaning of the word "throw a (monkey) wrench in the works" in English

What does "throw a (monkey) wrench in the works" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

throw a (monkey) wrench in the works

US /θroʊ ə ˈmʌŋ.ki rɛntʃ ɪn ðə wɜrks/
UK /θrəʊ ə ˈmʌŋ.ki rɛntʃ ɪn ðə wɜːks/
"throw a (monkey) wrench in the works" picture

Idiom

to cause a problem or difficulty that prevents something from happening or succeeding

Example:
The sudden resignation of the CEO really threw a monkey wrench in the works for our merger plans.
We had everything planned, but the bad weather threw a wrench in the works.