* It's a misspelling: Check for any typos. Maybe it's meant to be a different word like "mission" or "missionary."
* It's a regional dialect word: Could it be a word used in a specific region or community?
* It's a made-up word: If you encountered it in a fictional context, it could be a fabricated term.
To get a better understanding, please provide more context:
* Where did you encounter this word? (book, movie, conversation, etc.)
* What was the surrounding text or conversation? This might give clues to the meaning.
With more information, I can help you determine the meaning of "mishiha."