decompose
verb (used with object)
to separate or resolve into constituent parts or elements; disintegrate.
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Brewer says investigators believe the body had been decomposing for more than six months.
From Washington Times ● Apr. 6, 2016