flummox

Uncertain, probably risen out of a British dialect (OED finds candidate words in Herefordshire, Gloucestershire, southern Cheshire, and Sheffield). "The formation seems to be onomatopœic, expressive of the notion of throwing down roughly and untidily" [OED].[1]

• IPA^(key): /ˈflʌməks/

• Audio (Southern England)

  (file)

• Rhymes: -ʌməks

flummox (third-person singular simple present flummoxes, present participle flummoxing, simple past and past participle flummoxed)

1. (intransitive) To confuse; to fluster; to flabbergast.
   • 2011 January 22, “Man Utd 5 - 0 Birmingham”, in BBC‎:

     With United's movement flummoxing the visitors, Berbatov saw his low shot saved well by Ben Foster on his first return to Old Trafford.

2. (intransitive, uncommon) To give in, to give up, to collapse.

• See also Thesaurus:confuse

• flummoxable
• flummoxed
• flummoxer
• flummoxing