Xinshi (信使) is a Chinese word for “messenger”.
In the pinyin system of rendering Mandarin, both 'x' and 'sh' represent sounds like English 'sh'. The difference is where you put your tongue. 'Xin' should be spoken with your tongue behind your bottom teeth. 'Shi' should be pronounced with your tongue curled up against your palate, although it'll be easier if you just pronounce it like a normal, English 'sh'. Together, they should be pronounced roughly /shin-shih/
If you're feeling really fancy, 'xin' should be spoken in a falling tone, while 'shi' should be spoken in a high-low-high swooping tone.
That's beside the point. Heralds should know how to pronounce weird things, anyway
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