Archaic second-person singular past tense of 'did,' used with the old English pronoun 'thou' (you).
From Old English 'didest,' combining 'did' (past of 'do') with the archaic suffix '-est,' which marked second-person singular forms when addressing a single person formally or intimately.
This word shows how English once had special verb endings for different people—you'd say 'thou diddest,' he/she 'did,' we 'did'—a complexity we've mostly abandoned except in Shakespeare and the Bible!
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