1yawn 
/ˈjɑ:n/ verb
yawns; yawned; yawn·ing /ˈjɑ:n/ verb [no obj] 1 : to open your mouth wide while taking in breath usually because you are tired or bored
▪ Students were yawning in class. 2 of an opening, hole, etc. : to be deep, large, etc.
▪ A deep chasm yawned [=gaped] below us.
▪ Students were yawning in class.
▪ A deep chasm yawned [=gaped] below us.
