the inverse of moon (to show one's bare buttocks), therefore 'to sun' is 'to show one's genetalia'
mooning them wasn't humiliating enough, so he whipped down his drawers and sunned them.
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verb- showing off, displaying, bringing into the sunlight.
Daniel over there is sunning his new shoes. Everybody can see how cool they are.
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Louis William Tomlinson, a British singer-songwriter, a former member of the very popular British-Irish band One Direction, and a future manager as he has recently announced that he is going to be starting his own management company. Fans, who also call themselves 'Louies,' refer to him as the sun because his smile 'lights up our world like nobody else.' He is adorable in every way and it is impossible to live without him.
"The Sun is so beautiful."
"Yeah, I love Louis Tomlinson too."