Definition of sun:
(n) :
the star which the
Earth revolves around and receives light and warmth from.
[The Illustrated Oxford Dictionary, Oxford University Press, 1998]; a
star,
[ especially when seen as the centre of any single solar system
]
(v) :
to expose to the warmth and radiation of the sun.[; to warm or dry in the sunshine.][
]
"beautiful bodies lying on the beach, sunning their bronzed limbs."