pępek 英語で:

To display a bare navel.

The girl had a pierced navel. The mark on the surface of the abdomen that indicates where the umbilical cord was attached to the fetus during gestation.

... bearing plants(think of navel oranges) normally propagate only...

When I was inside my mother's womb, I looked through my mother's navel at the house where I would be born and I thought: "This won't do".