He finally decided to relinquish his inheritance rights to his younger brother.

relinquish 是动词，由前缀 re-（表示“向后”）和词根 linquere（拉丁语，意为“离开”）组成，字面意思是“向后离开”，引申为“放弃、让出”的意思。在这里指自愿放弃原本拥有的权利或财产。