motion

/ˈmoʊʃən/

the use of movements (especially of the hands) to communicate familiar or prearranged signals

中文释义：手势；动作

The referee made a motion with his hand to indicate a foul.

裁判用手势示意犯规。

She used a series of motions to communicate with the deaf student.

她用一系列手势与聋哑学生交流。