RichThesaurus
put a monkey wrench in the works of
vs
throw a spanner in the works
put a monkey wrench in the works of
throw a spanner in the works
verb
To introduce a problem, dilemma or obstacle, something unexpected or troublesome.
How often have the words
put a monkey wrench in the works of
and
throw a spanner in the works
occurred in a corpus of books?
(source:
Google Ngram Viewer
)