to press the buttons of the keyboard repeatedly while using a computer

In the newsroom, reporters answer phones and click away at their computers. 在新闻编辑室里，记者们或是在打电话或是忙碌地在计算机前敲打键盘。

If a machine, clock, camera, etc., clicks away, it makes a repeated short, sharp sound while operating or being operated.

The clock clicks away at the Kennedy Space Center. 肯尼迪太空中心的时钟滴答作响。

Camera phones clicked away, trying to get a close-up shot of the president. 手机上的相机咔嚓不停，都想拍到总统的近照。