Origin of yawner
Examples from the Web for yawner
Some were busy at arithmetic, while, every moment, whack went the rod upon the crown of the idler or yawner.
If he attempts to take some of our big banked bullfinches in his stride, with a yawner on each side, will get into grief.'Mr. Sponge's Sporting Tour|R. S. Surtees
1680s, agent noun from yawn (v.). Meaning "boring thing" is 1942, American English colloquial (yawn in this sense is attested from 1889).