sign language

1. N-VAR Sign language is movements of your hands and arms used to communicate. There are several official systems of sign language, used, for example, by deaf people. Movements are also sometimes invented by people when they want to communicate with someone who does not speak the same language. 手势语

Her son used sign language to tell her what happened. 她的儿子用手势语告诉她发生的事情。