The tongue, or more commonly used in 'lingua franca' meaning a common language used for communication between different groups.
Latin lingua meaning 'tongue' or 'language,' from the Proto-Indo-European root *dn̥ǵʰwéh₂s. The connection between tongue and language reflects the physical basis of speech.
The phrase 'lingua franca' literally means 'French tongue' but originally referred to a Mediterranean pidgin language mixing Arabic, Greek, French, and Italian used by traders - showing how commerce drives language contact.
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