To rescue or save someone/something from danger or difficulty; to help someone out of a bad situation.
消防隊が川で溺れていた子どもを救った。
The fire brigade rescued a child who was drowning in the river.
みんなの寄付が多くの命を救った。
Everyone's donations saved many lives.
あの医師の的確な処置が患者の命を救った。
That doctor's precise treatment saved the patient's life.