Past tense of dig; to break up soil or excavate a hole.
From Middle English 'diggen,' possibly from Old Norse 'deyja.' The exact origin is unclear, but it appeared in English by the 1300s.
Dig/dug is one of English's few truly irregular verbs that survives from Old English—most verbs shifted to regular '-ed' endings, but dig stubbornly kept dug!
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