How is “waste away” used?

In The Dawn Wall (2017), one line is: “You know, we're sort of just wasting away.”

Which movie is “waste away” from?

The clip at the top of this page is from The Dawn Wall (2017).

to become thin and weak, especially because of illness

Heard in 7 movies

Oxford100% of films
to become thin and weak, especially because of illness
So, why does the human continue to waste away?

Definitions from the Oxford Advanced Learner's Dictionary, 9th edition

You know, we're sort of just wasting away.

Said in 8 films · #1