Yawning

Definition and stakes

Percy F. Westerman,  The Winning of the Golden Spurs (May 16, 2011 [eBook #36122] [Most recently updated March 15, 2022])

“ A yawning pit, partially concealed by a screen of hurdles and bracken, lay across the narrow way, while a score of paces beyond was a tree trunk, which, having been skilfully cut through close to its base, needed but little effort to fall into its present position, effectually barring the road to any but unmounted men. ”
Source: Gutenberg

Joel Dorman Steele,  Hygienic Physiology : with Special Reference to the Use of Alcoholic Drinks and Narcotics

“ It is caused by a contraction of the diaphragm and a constriction of the glottis; the current of air just entering, as it strikes the closed glottis, gives rise to the well-known sound. Yawning, or gaping, is like sighing. [Footnote: The usefulness of a yawn lies in bringing up the arrears, as it were, of respiration, when it has fallen behindhand, either through fatigue or close attention to other occupation. The stretching of the jaws and limbs may also serve to equalize the nervous influence, certain muscles having become uneasy on account of being stretched or contracted for a long time.] ”
Source: Gutenberg

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