Noun
a life of its own (plural lives of their own)
(idiomatic) An independent existence with some characteristics of life.
By the end of the Second World War, every American past the age of 40 had been subjected to some 25 years of anti-communist radiation, the average incubation period needed to produce a malignancy. Anti-communism had developed a life of its own. William Blum
You may not always have a comfortable life and you will not always be able to solve all of the world's problems at once but don't ever underestimate the importance you can have because history has shown us that courage can be contagious and hope can take on a life of its own. Michelle Obama
So the ideology was that: use sounds as instruments, as sounds on tape, without the causality. It was no longer a clarinet or a spring or a piano, but a sound with a form, a development, a life of its own. Luc Ferrari
The one hit song that I have tremendous gratitude for is Boots, because it has a life of its own. It's like being identified with a brand name. Nancy Sinatra
I think the quality of something like the Beveridge, for instance, will have a life of its own. Neville Marriner
It's sensational to be a part of a series that takes on a life of its own. Robert Wagner