To separate the grain or seeds from (a cereal plant or the like) by some mechanical means.

打谷。

To beat as if with a flail.

打；击打。

To discuss or go over (an issue) repeatedly.

反覆讨论(某问题)。

To thresh wheat, grain, etc.

打縠。

To deliver blows as if with a flail.

打；击打。