yawning

oscitance

act of gaping

opening the mouth

Nuut

1. To open the mouth widely and take a long, rather deep breath, often because one is tired or bored, and sometimes accompanied by pandiculation.
2. To say while yawning.
3. To present a wide opening; gape.
4. (obsolete) To open the mouth, or to gape, through surprise or bewilderment.
5. (obsolete) To be eager; to desire to swallow anything; to express desire by yawning.