From Middle English dede, from Old English dēd, dǣd, from Proto-West Germanic *dādi, from Proto-Germanic *dēdiz, from Proto-Indo-European *dʰéh₁tis. Analyzable through Proto-Germanic as do + -th. thesis.
Cognate with West Frisian died, Dutch daad ("deed, act"), German Low German Daad, German Tat, Swedish, Norwegian and Danish dåd. The Proto-Indo-European root is also the source of Ancient Greek θέσις.
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