sunbathed, past participle; sunbathes, 3rd person singular present; sunbathing, present participle; sunbathed, past tense;
Sit or lie in the sun, esp. to tan the skin
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it was too hot for sunbathing
Web Definitions:
sun: expose one's body to the sun
Sun tanning is the act of exposing the skin to ultraviolet (UV) radiation, for the purpose of darkening skin color, either during sun bathing or using artificial sources, such as tanning beds.