Duds' refers to bombs that fail to explode when they are dropped. These bombs are also known as dud ordnance, and they are a major problem for military forces because they can remain dangerous for years after they have been deployed. The term 'DUDS' is used to describe bombs that do not detonate when they are supposed to, which means that they are unable to fulfill their intended purpose. This can be due to a variety of factors, including faulty construction, improper handling, or even weather conditions. In any case, dud ordnance poses a significant risk to the safety of military personnel and civilians alike.