Where does “blunder” come from?

blunder (Middle English) comes from Middle English blondren, from Middle English blanden, from Old English blandan, from Proto-Germanic blandaną, from Proto-Indo-European bʰlendʰ- — to blend, to mix up; to make cloudy, opaque;...

Ancestry of “blunder”, step by step

blunder traces back through two separate lines of ancestry.

via Middle English blondren

StepLanguageWordMeaning
1Middle Englishblondren—
2Middle Englishblanden—
3Old Englishblandanto blend; to mix, mingle; to corrupt, make impure
4Proto-Germanicblandanąto blend, make murky; to mix, mingle
5Proto-Indo-Europeanbʰlendʰ-to blend, to mix up; to make cloudy, opaque;...

via Middle English blundren

StepLanguageWordMeaning
1Middle Englishblundren—
2Old Norseblundato shut the eyes; doze; to shut the eyes; to doze
3Proto-Germanicblundazblond; mixed, blinding
Every word from Proto-Indo-European bʰlendʰ- →Every word from Proto-Germanic blandaną →Every word from Old English blandan →
blunder — Etymology, Origin & Word History | Etymology Explorer