He still hasn't come to terms with his brother's death.

come 在这里是动词，意思是"达到某种状态"。 to 是介词，表示方向或结果。 terms 原意是"条款、条件"，在这里引申为"接受现实的状态"。 with 是介词，表示"与...相关"。 come to terms with 是一个固定短语，意思是"接受、适应（某种困难或不幸的情况）"。