This compound verb means to remain alongside someone or to stay with them through difficult circumstances. The prefix συν- adds the sense of companionship or shared experience to the basic meaning of 'remain.' Classical authors used it for a woman who remained with her husband through misfortune, demonstrating loyalty in adversity. It could also mean enduring as long as life itself lasts, staying the course through the duration of something. The word emphasized faithful presence rather than mere physical proximity—standing by someone when others might abandon them, or persisting when circumstances made departure tempting.