undergo
verb (used with object)
to be subjected to; experience; pass through.
had been undergoing
-
past perfect progressiveof undergo.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.
In March 2023, Sir Sam revealed he had been undergoing chemotherapy for a year after being diagnosed with non-Hodgkin's lymphoma, a type of blood cancer that affects the lymphatic system.
From BBC ● Jul. 13, 2026
The tower blocks had been undergoing renovations when the fire began.
From BBC ● Nov. 28, 2025
After a media frenzy about the Princess of Wales' whereabouts, the 42-year-old Kate Middleton revealed in March that she also had been undergoing cancer treatment in a video.
From Salon ● Dec. 20, 2024
Sophie Kinsella, the best-selling English author of the “Shopaholic” book series, revealed on social media on Wednesday that she had been undergoing treatment for an aggressive and often fatal form of brain cancer.
From New York Times ● Apr. 17, 2024
It happened that the paving of one of the aisles had been undergoing repair at the time of Cavendish’s attack upon the town.
From Across the Spanish Main A Tale of the Sea in the Days of Queen Bess by W. (William) Rainey
