An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once. The original word or phrase is known as the subject of the anagram. Any word or phrase that exactly reproduces the letters in another order is an anagram.
I say it all the time, I know what it means, but how did they come up with that phrase? Meaning that it is not alive, unequivocally deceased it can be figuratively or literally defunct – the phone line is deader than a door nail or that possum, you ran over, is as dead as a doornail.