mutate
verb (used with object)
to change; alter.
had been mutating
-
past perfect progressiveof mutate.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.
Trevor Bedford, a biostatistician at the Fred Hutchinson Cancer Research Center, said the coronavirus had been mutating at several times the rate of the flu virus, for which vaccines are redesigned annually.
From New York Times ● Apr. 6, 2022
