"另行邮寄给某人"的英文表达是 "send separately to someone".

这个表达方式来源于英语中使用"send"作为"邮寄"或"寄送"的动词，而"separately"则表示"分别地"或"单独地"。

下面是一些使用这个表达的例句及其中文翻译：

Could you please send the documents separately to my office? (请把文件单独寄到我的办公室吗？)

I need to send this package separately to my friend in another city. (我需要把这个包裹单独寄到另一个城市的朋友。)

Could you send the tickets separately to my sister's address? (你能把票分别寄到我妹妹的地址吗？)