Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Sour
Sour as Melancholy.
—Robert Burton
Sour as verjuice.
—Thomas Dekker
As sour as though he had swallowed
A sloe-bush.
—Maria Lowell
Sour as a rotten orange.
—Justin Huntley McCarthy
Sour as lees in wine.
—Brian Melbancke
Sour as sorrel.
—Thomas Sackville