Missing dggggg kkdf sjjjg hhg happy trim test gert sre beet
closed as off topic by kiamlaluno, Mitch, J.R., Robusto, tchrist Aug 9 '12 at 19:32
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It appears to be a metaphor, where death is a coffin, and that coffin opens up to release, --I'm presuming -- the author's beloved.
Thanks for including the link. Here is the whole stanza:
For what it's worth: the narrator says "your" name, the name becomes a "key" to open "the dark," itself a metaphor for death, probably the lamented death of "you."
When "death swings open on its hinge" the narrator receives "a gift, the blush of memory" i.e. the memory of "you."
In other words, "death swings open on its hinge" means in this case alone, the unlocking of the memory of the "you" addressed in the poem. You wouldn't want to generalize from this to any other context, however, unless you were quoting the poem in some relevant circumstance!