RichThesaurus
knock for a loop
vs
throw for a loop
knock for a loop
verb
To astonish; to stagger or overwhelm; to confuse or disorient.
throw for a loop
verb
Synonym of knock for a loop
How often have the words
knock for a loop
and
throw for a loop
occurred in a corpus of books?
(source:
Google Ngram Viewer
)