From Longman Dictionary of Contemporary Englishsign languageˈsign ˌlanguage noun [countable, uncountable] SLLa language that uses hand movements instead of spoken words, used by people who cannot hear well
Examples from the Corpus
sign language• Very frequently in the literature earlier discussions about sign language universality are described as myths or misconceptions.• Some deaf children are, however, very proficient at sign language and they can also spell out words using finger spelling.• His sign language was, on the whole, positive.• In sign language terms these would include: Do hearing people control the fortunes of deaf people politically and economically?• About half the employees are deaf and all speak sign language.• Many hearing people assume that sign language is the same the world over.• By now I was extremely hungry, so I used sign language to beg the official for food. 