Related phenomenon: Mother-in-law-speech, where the language you use changes when you speak to your in-laws. There's an Australian language that has clicks, bu

Related phenomenon: Mother-in-law-speech, where the language you use changes when you speak to your in-laws. There's an Australian language that has clicks, but only when talking to the mother in law. https://en.wikipedia.org/wiki/Avoidance_speech https://en.wikipedia.org/wiki/Avoidance_speech