Your humble servant has a matter to report to Your Majesty.
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Classical / historical. You'll hear it constantly in palace dramas (宫廷剧, gōngtíngjù) but never in modern speech. The literal sense is 'tiny / lowly minister.'
history
One of a whole system of self-deprecating pronouns used at court: 微臣 (officials), 奴婢 núbì (eunuchs/maids), 儿臣 érchén (princes addressing the emperor as parent).
