upgrade
noun
an incline going up in the direction of movement.
had been upgrading
-
past perfect progressiveof upgrade.past perfect progressive
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Last week, 38 North, a North Korea monitoring project affiliated with Washington’s Stimson Center think tank, said satellite imagery showed the North had been upgrading its Yongbyon nuclear complex.
From Reuters ● Jul. 2, 2018
Workers had been upgrading science labs at the school.
From New York Times ● Sep. 2, 2015
