Dickinson opens a poem about an abyss the way you might bring up an awkward errand: "This Chasm, Sweet, upon my life / I mention it to you." The casual tone is the first thing to notice. The chasm sits "upon" her life, like a weight or a shadow, yet she tells a loved one about it as if confiding a small worry. That gap between enormous subject and quiet manner drives the whole poem.
She never names the chasm, but the vocabulary around it is clear enough: "Tomb," "Doom," "Burial," "Death." The first stanza adds something less expected. When sunrise "through a fissure drop[s]," the day must follow. The crack that lets in light is the same one that opens into the grave. One way to read this is that living and dying pass through the same opening, so there is no morning without the gap. That is an inference, but the image supports it, because the poem never treats the chasm as something that can simply be avoided.
The second stanza loosens the grammar as the threat grows closer. "Ourself am lying straight wherein / The Favorite of Doom" slides from the plural "we" to the singular "Ourself" and then to "am," as if the speaker can't hold a steady identity while picturing herself in the tomb. "Favorite of Doom" is bitterly ironic. Doom has a favorite just as she has a "Darling," and the chosen one is the person who ends up in the ground.
The chasm then becomes almost alive. It will close once it has "just contained a Life," yet each day it grows "bolder" and more "turbulent." Closing and growing seem to pull against each other, and the picture is of an appetite that waits to be fed. Then comes the most surprising move. The speaker is "tempted half to stitch it up / With a remaining Breath." Domestic needlework is set against something geological, and breath becomes thread. She says she "should not miss" that breath, though "To Him, it would be Death." Who "Him" is, the poem doesn't say. It could be the person she addresses, or Death or God personified, and the ambiguity leaves a faint sense of someone else paying the cost of her mending.
The final stanza is the strangest. "I bear it big about / My Burial" echoes the language of pregnancy, of carrying something openly and heavily. Her burial is not a distant event but something she is already carrying, visible to everyone. The last lines suggest what she gains from this. Once the burial is carried, "A Life quite ready to depart / Can harass me no more." Having taken the grave inside herself, she is no longer tormented by the fear of leaving. The dash at the end leaves the thought open rather than tied off, which suits a poem that never fully settles its own comfort.
The form works against all this turbulence. The poem is built from five quatrains of alternating longer and shorter lines, roughly eight syllables then six, which gives a hymn-like or ballad-like feel. Only the second and fourth lines rhyme: you/too, Tomb/Doom, close/grows, Breath/Death, before/more. The rhymes are mostly full, and the pairings carry meaning. "Breath" and "Death" end a stanza together, so the thing she would spend and the thing it would cost sound almost identical. "Tomb" and "Doom" close their stanza on a dark, hollow vowel. The steady pulse of the stanzas makes the speaker sound composed even as the chasm "grows."
The poem is significant for how it shrinks the largest subject to human scale. Death is something to be mentioned, stitched, and carried. The capitalised nouns and the sparing but pointed dashes are typical of Dickinson, who left behind nearly 1,800 poems, and here they help each abstract word land with the weight of a name. The poem doesn't conquer its fear or explain it away. It finds a way to live beside it, tenderly and a little wryly, and it is that mixture of intimacy and dread that makes the chasm so hard to forget.