My thoughts on the title

[eggplant107]

No: HPFGUIDX 163091

So what does "Deathly Hallows" mean? It would certainly help if we
knew if "Hallows" was a verb or a noun, but here are my guesses.

1) The most obvious guess a Horcrux, perhaps too obvious. 

2) An elite group of Death Eaters, the best of the best, or perhaps I
should say the worst of the worst. Yes, I know "hallows" can mean
saints, but I think calling someone a member of the Deathly Hallows is
a little like calling Josef Mengele the "Angel of Death"; and "Hell's
Angels" does not conjure up images of sweetness and light. 

3) Perhaps it just refers to a graveyard.  

4) Maybe it's a time not a place or thing, the time Lilly and James
were murdered, Halloween night.

It was a good choice to use the word "Deathly" rather than the more
common word used it titles "Deadly", to my ears deathly has a more
sinister ring to it. It's also interesting that this is the first
Potter book to have death in the title, and given that this is the
last book
 well, I think Harry would have difficulty buying life
insurance about now.

Eggplant