…a rounded knotty depression in the centre of a person’s belly caused by the detachment of the umbilical cord after birth; the umbilicus…
…complacent concentration on oneself or a single issue at the expense of a wider view…
…a large seedless orange of a variety which has a navel-like depression at the top containing a small secondary fruit…
…spend time complacently considering oneself or one’s interests at the expense of a wider view…
