To have one's mind divided between two concerns; to be preoccupied with two different matters simultaneously.
妈妈工作很忙，还要照顾两个孩子，所以她经常一心挂两头，总是担心无法兼顾周全
Mom is very busy with work and also has to take care of two children, so she often has her mind divided between two concerns, always worrying about not being able to manage everything perfectly.
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