He could not reconcile himself to the fact that his idea had been rejected.

reconcile 是动词，意思是"使和解、使和谐"，在这里引申为"使接受、使妥协"。 himself 是反身代词，指代主语"他"，表示动作作用于自身。 to 是介词，在这里表示"对于、关于"。 reconcile oneself to 是一个固定短语，意思是"使自己接受、使自己适应"某种情况或事实。