Taboo
The English word “taboo” comes from the Tongan word tapu or the Fijian word tabu. These words usually mean "not allowed", or "forbidden". In its current use in Tonga, the word tapu also translates to "sacred" or "holy", this means something that is protected by custom or by law.  For example, the main island in the Kingdom of Tonga, where the capital Nuku'alofa is located and most of the population resides, is called "Tongatapu".