The phrase "cast a spell over" refers to the act of enchanting someone or something with a magical force. There are several synonyms that can be used instead of this phrase, such as bewitch, enchant, captivate, mesmerize, fascinate, charm, entrance, enthrall, and beguile. Each of these words denotes the power to hold someone's attention or emotions, often implying that the effect is not entirely voluntary or rational. Whether used for storytelling or to describe a particular behavior, using these synonyms helps to convey the sense of entrancement and magic that occurs when someone is under the spell of another.