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navel; belly button
protrusion or depression in the middle of an object
center; centre; most important part; main point
赤ちゃんのへその緒は出産後に切られるものだよ。
A baby's umbilical cord is cut after birth.
へそを出した服を着るのは勇気がいると思うな。
I think it takes courage to wear clothes that show your navel.
へその周りに湿疹ができて皮膚科に行ってきた。
I got a rash around my navel and went to the dermatologist.