sign language
noun [ U or C ] uk/ˈsaɪn ˌlæŋ.ɡwɪdʒ/ us/ˈsaɪn ˌlæŋ.ɡwɪdʒ/
(also sign [ U ])手语，手势语
a system of hand and body movements representing words, used by and to people who cannot hear or talk
（语言不通时进行交流采用的）手势，比划
the movements that people sometimes make when talking to someone whose language they do not speak