Here are some possibilities:
* "Curtail": This is the most likely meaning. It means to shorten, reduce, or limit something.
* "Turtle": This is a common misspelling of the word for a reptile with a shell.
* A regional slang term: "Curtle" might be a slang term used in a specific area, but it would need more context to determine its meaning.
If you provide more context, such as the sentence where you encountered the word "curtle," I may be able to give you a more accurate answer.