山寨的英语怎么说？

比较贴切的词是copycat
copycat做形容词：similar to something else and considered to be a copy of it与其他的东西相似并且抄袭自那种东西
copycat做名词：someone you think has copied exactly what someone else has done, and seems to have no ideas of their own复制了其他人做的东西，并且没有自己的创意
事实上，海词在线里copycat的中文解释就有“山寨”这一项

华尔街日报直接用shanzhai，

跟老外聊天有对方用copycat，

也有knockoff，n. (售价低廉的)冒牌服装;名牌仿制品。
A knockoff is a cheap copy of a well-known product. (INFORMAL)
E.g. Frilly dresses are out; Chanel knockoffs are in...
You can buy a nice knockoff watch from them.

pirate应该是盗版，

也有口语里用rip-off

形容词：fake
名词及词组：fake commodity

copycat 模仿制造，山寨

replica复制品，酷似的东西