A person who shares something jointly with another; one who divides or partakes in something along with others.
From 'co-' (together) + 'sharer' (one who shares). The prefix-based construction follows standard English patterns for forming words describing mutual or joint action.
Medieval documents show 'cosharer' describing peasants who worked shared land together—it's a word from a time when property was more communal and less about individual ownership.
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