belly button 
noun informal
A person’s navel.Squeeze your buttocks, draw your belly button to your spine and tilt your pelvis....
- She is nude and the image shows her body from her belly button to her knees.
- Most want ear or nose piercings, although a few prefer to have their belly button or genitals pierced.
- pass door
- passecaille
- passecalle
- Passe Crasanne
- Passe Crassane
- passed ball
- passed-down
- passed master
- passed-on
- passed-out
- passed-over
- passed pawn
- passeggiata
- passeguard
- passel
- passement
- passementerie
- Passendale
- Passendale, Battle of
- passenger
- passenger cell
- passenger coach
- passenger door
- passenger-kilometer
- passenger-kilometre