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What is the original meaning of krap/ka politeness particles and what are their equivalents in Indo-European languages?

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According to the Thai wiktionary ขอรับ kráp is a shortening of ขอรับ kɔ̌ɔ-ráp "ask to serve" = "may I serve you?". , however, is uncertain.

I don't think there's a single equivalent to these politeness markers in IE languages, where politeness and gender are marked by different mechanisms.

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