Here's how you can understand it based on its construction:
* De- is a prefix that often indicates the opposite or reversal of something.
* Enhance means to improve or make something better.
Therefore, "deenhance" could mean:
* To make something worse or less effective.
* To reduce the quality or intensity of something.
* To diminish or weaken something.
However, without more context, it's impossible to say for sure what the word is meant to convey.
If you encountered this word in a specific context, please provide it so I can give you a more accurate interpretation.