throw for a loop
verb1
Synonym of knock for a loop.
- really threw me for a loop; threw us all for a loop
- He thought he was up-to-date on all the latest wine lingo until a longtime wine writer returned his sample request card with a bold, hand-written note on it that stated, “Send me all samples—ABC!” “ABC” threw my friend for a loop. When he called me, I translated the cryptic phrase—ABC is winespeak for “Anything But Chardonnay.”1997 March, Ron Loutherback, “Beyond the Label: The ABCs of white wine”, in Orange Coast, volume 23, number 3, page 168: