Where does “verzweifachen” come from?

verzweifachen (German) comes from German zweifach, from German zwei, from Middle High German zwēne, from Old High German zwēne, from Proto-West Germanic twai-, from Proto-Germanic twai, from Proto-Indo-European dwóh₁ — two.

verzweifachen (German): to multiply by two, to double, to redouble

Definitions

  1. to multiply by two, to double, to redouble

Ancestry of “verzweifachen”, step by step

verzweifachen traces back through two separate lines of ancestry.

via German zweifach

StepLanguageWordMeaning
1Germanzweifachtwofold, double; dual; duplicate
2Germanzweitwo
3Middle High Germanzwēnetwo
4Old High Germanzwēnetwo
5Proto-West Germanictwai-two
6Proto-Germanictwaitwo
7Proto-Indo-Europeandwóh₁two

via German ver- -en

StepLanguageWordMeaning
1Germanver- -enForms factitive verbs from adjectives, meaning "to make more (adjective)"
Every word from Proto-Indo-European dwóh₁