Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Yawn
Yawned much as a bored tiger does in the face of a philosophical student of savage manners in the zoölogical gardens.
—Edward Bulwer-Lytton
Yawns like a grave in a cemetery.
—Victor Hugo
Yawn’d like a gash on warrior’s breast.
—Sir Walter Scott
Yawn and stretch like a greyhound by the fireside.
—Sir John Vanbrugh