English▸ adjective (of an opening or space) very large and wide:
the yawning entrance of the cave
my headlights picked out what seemed to be a yawning chasm in the middle of the bridge
figurative the yawning gap between rich and poor.
▸ noun the reflex action of opening the mouth wide and inhaling deeply due to tiredness or boredom:
yawning is so contagious that we only need to read about it to want to yawn ourselves.