an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom; "he could not suppress a yawn"; "the yawning in the audience told him it was time to stop"; "he apologized for his ostinancy"

with the mouth wide open indicating boredom or sleepiness; "a yawning congregation"

showing lack of attention or boredom; "the yawning congregation"

The yawning, Poromitra oscitans, is a fish of the genus Poromitra, found in tropical and subtropical waters of the indo-Pacific region, at depths of from 800 to 5000 metres. Their length is from 7 to 10 centimetres.

gaping open as if threatening to engulf someone or something; "the yawning mine shaft"; "a yawning abyss"