(用机器)使脱粒;(尤指旧时手持工具)打(稻、麦等)to separate grains of rice, wheat , etc. from the rest of the plant using a machine or, especially in the past, by hitting it with a special tool
2.
[i][t]
~ (sth)
(使)剧烈扭动,翻滚to make, or cause sth to make, uncontrolled movements