Where does “polar bear dip” come from?

polar bear dip (English) comes from English DIP, from Middle English dippen, from Old English dyppan, from Proto-Germanic dupjaną.

Ancestry of “polar bear dip”, step by step

polar bear dip traces back through two separate lines of ancestry.

via English DIP

StepLanguageWordMeaning
1EnglishDIPAcronym of dual in-line package; Acronym of...
2Middle Englishdippen
3Old Englishdyppanto dip
4Proto-Germanicdupjaną

via English polar bear

StepLanguageWordMeaning
1Englishpolar bearA very large bear, "Ursus maritimus" found in the...
Every word from Proto-Germanic dupjaną
polar bear dip — Etymology, Origin & Word History | Etymology Explorer