fester
verb (used without object)
to form pus; generate purulent matter; suppurate.
Used to describe an action that will be fully completed or achieved by a specific point in the future.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Some level of tension was evident within the squad at the get-together in November for the friendlies against Spain and Sweden and it will have festered since.
From The Guardian ● Feb. 9, 2012