She re-gifted the unwanted perfume to her friend as a birthday present.

re-gifted 是由前缀 re-（表示“重新、再次”）和动词 gift（赠送）组成的复合动词，加上 -ed 表示过去式。re-gift 的字面意思是“重新赠送”，指将收到的礼物转送给别人。