Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Yawning
Yawning wide like the mouth of a cavern.
—John Dennis
Yawning destruction, deep as the grave.
—Charles Kisfaludy
Yawning, like some old crater rent anew.
—Thomas Moore
Yawning silently like an image.
—Octave Uzanne