n.槍柄；錫杖附有尖形銅帽的

He's as plain as a pikestaff, poor boy, and keenly aware of it. 可憐的孩子，他相貌平平，而且有自知之明。

Don't tell me you can't see where you've painted over the frame and onto the window, it's as plain as a pikestaff. 不要告訴我你不知道你把油漆刷過了架子，而刷到了窗戶上，那不是明擺著的么。