ship做不及物动词的理解

曹老师你好，下句中句末when状语从句中的ship to....该怎么样理解？我看ship表示运送货物大多是及物动词，不及物动词的解释是“to be sent for delivery”，那这里感觉有的逻辑不通。

Until now, many sellers that have a physical presence in only a single state or a few states have been able to avoid charging sales taxes when they ship to addresses outside those states. 

when they ship to addresses outside those states 

they显然指的是sellers, ship to addresses 显然是ship purchases to addresses 的意思。这种使用方法手头常见的词典中确实没，或许过一段时间词典就会网站收录。