I forgot my wallet, but thankfully, Anna came to the rescue and loaned me some cash.

came 是动词 come 的过去式，意思是"来"。 to 是介词，表示方向或目的。 the 是定冠词，表示特指某个事物。 rescue 是名词，意思是"救援、救助"。 came to the rescue 是一个固定短语，字面意思是"来到救援"，引申为"出手相助、救急"的意思。