Past tense of dote; showed excessive fondness, lavished affection, or expressed weakness of mind (especially from old age).
From 'dote', with regular past tense formation. 'Dote' comes from Old Norse 'dota' (to be silly) and has been used in English since Middle English times.
Parents 'dote on' their children, but elderly people were said to 'dote from' senility—the same word carries opposite implications depending on context, which is why careful reading of Shakespeare requires understanding these double meanings.
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