Could you please provide more information or context? For example:
* What is the full term or phrase? Is it part of a longer word or phrase?
* What is the topic you are asking about? Are you referring to a specific field like biology, technology, culture, etc.?
* Where did you encounter this word? Was it in a book, article, website, or conversation?
With more information, I can try to help you understand what "uchil" might mean.