"他目送他上船"的英文表达为 "see him off onto the ship"。这个短语的意思是指，有一个人在岸边看着另一个人登上船，并且在船离开之前目送他离去。这个短语的来源可能源于人们在送别亲人或朋友时经常使用的惯常用语。

下面是几个使用 "see him off onto the ship" 的英文例句，以及它们的中文翻译：

I went to the port to see my friend off onto the ship. He was going on a long voyage and I wanted to make sure he had a safe journey. (我去了港口，看着我的朋友登上船。他要开始一次长途航行，我想确保他旅途愉快。)
The whole family went to the airport to see their son off onto the plane. They were all teary-eyed and emotional as they hugged and said goodbye. (整个家庭都去了机场，看着他们的儿子登上飞机。他们都流着泪，情绪激动地拥抱并告别。)
We stood on the pier and watched as our friends boarded the cruise ship. It was a bittersweet moment as we said our goodbyes and promised to keep in touch. (我们站在码头上，看着我们的朋友们登上邮轮。这是一个既甜蜜又痛苦的时刻，我们告别并承诺保持联系。)