The character 'jun' is the old form of 浚, to dredge a river.
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濬 is an old, fuller form of 浚 ('to dredge / deepen a channel'); modern Chinese writes 浚 for that meaning. It survives only in classical text, place names like 濬县, and personal names. The water radical 氵 marks the watercourse meaning.
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Archaic. For the dredging sense always write 浚 in modern text; 濬 appears only in old documents and names.