м.
participant, participator; ( в пае ) sharer; ( преступления ) accomplice; ( состязания ) competitor; ( в игре ) player; ( съезда ) member
он участник гражданской войны — he took part in the civil war
участник экспедиции — member of an expedition
он участник заговора — he is, или was, a party to the plot, he takes, или took, part in the plot