But at my back in a cold blast I hear
The rattle of the bones, and chuckle spread from ear to ear.

from T.S. Eliot – The Waste Land on Rap Genius

Meaning

But at my back in a cold blast I hear
The rattle of the bones, and chuckle spread from ear to ear.

The first time in the poem Andrew Marvell’s “To His Coy Mistress is referenced, but not the last. Here, Eliot alludes to lines 21-22 specifically.

But at my back I always hear
Time’s winged chariot hurrying near;

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