Avoidance speech

Avoidance speech is a group of sociolinguistic phenomena in which a special restricted speech style must be used in the presence of or in reference to certain relatives, or in certain situations. Avoidance speech is found in many Australian Aboriginal and Austronesian languages as well as some North American languages, Highland East Cushitic languages and Southern Bantu languages. Chinese naming taboo prohibits speaking and writing syllables or characters that appear in the names of esteemed people, such as emperors, parents, and ancestors.

Avoidance speech styles tend to have the same phonology and grammar as the standard language they are a part of. The lexicon, however, tends to be smaller than in normal speech since the styles are only used for limited communication.

Australia

Mother-in-law languages

Avoidance speech in Australian Aboriginal languages is closely tied to elaborate tribal kinship systems in which certain relatives are considered taboo. Avoidance relations differ from tribe to tribe in terms of strictness and to whom they apply. Typically, there is an avoidance relationship between a man and his mother-in-law, usually between a woman and her father-in-law, and sometimes between any person and their same-sex parent-in-law. For some tribes, avoidance relationships are extended to other family members, such as the mother-in-law's brother in Warlpiri or cross-cousins in Dyirbal. All relations are classificatory – more people may fall into the "mother-in-law" category than just a man's wife's mother.