adynaton

adynaton, a kind of hyperbole in which the exaggeration is so great that it refers to an impossibility, as in the following lines from Andrew Marvell’s “To His Coy Mistress”:

Had we but world enough, and time
This coyness, lady, were no crime.
We would sit down, and think which way
To walk, and pass our long love’s day.
Thou by the Indian Ganges’ side
Shouldst rubies find; I by the tide
Of Humber would complain. I would
Love you ten years before the flood
And you should, if you please, refuse
Till the conversion of the Jews.