This is the 4562nd most frequent Arabic word.
أسرهم
"Their captivation" or "their capture," depending on context.
Here, 'أسرهم' means that the narration 'captivated' or 'enchanted' the listeners with its excellency.
سحرتهم القصة بجمالها وأسرهم السرد بأسلوبه الرائع.
The story charmed them with its beauty and captivated them with its excellent narration.
In this sentence, 'أسرهم' conveys that the beauty of nature 'enthralled' or 'enchanted' them.
أحبوا منظر الطبيعة الذي أسرهم بسحره الأخاذ.
They loved the view of nature that enthralled them with its breathtaking charm.
This usage of 'أسرهم' indicates that the calm atmosphere 'captivated' or 'impressed' them significantly.