Wiktionary
wasting away
vb. (present participle of waste away English)
WordNet
Wikipedia
Wasting Away
Wasting Away (which has also been released with the title Aaah! Zombies!!) is a 2007 zombie comedy. The events of the plot take place from the zombies' point of view. The film uses color footage to show the action from the zombies point of view in which they see themselves as normal humans and occasionally switches to black-and-white footage to show the zombies from the point of view of normal humans.
Usage examples of "wasting away".
Avi looks like he is wasting away from some vague disease invented as a plot device by a screenwriter.
There is nothing for you here, you are wasting your abilities and you are wasting away of boredom.