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Changing something, particularly within a group of people, that affects everyone. This change can be seen as uncomfortable or different, and will not go unnoticed, however small it is.
When Evan pulled the lunch table forward, if only a few inches, he had fenged up the shui for everyone sitting at it.

Emily: Stop fenging up the shui by trying to switch us to 2% milk!
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by Flying starfruit August 03, 2016
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