forearm

前臂、小臂

He broke his left forearm while skateboarding last summer.

他去年夏天玩滑板時弄斷了左前臂。

預先武裝、預作準備正式；常用被動

Forewarned is forearmed, so read the safety notice carefully.

事先有警覺就是事先有準備，所以請仔細閱讀安全須知。