From Longman Dictionary of Contemporary Englishsunbathesun‧bathe /ˈsʌnbeɪð/ verb [intransitive] DLOto sit or lie outside in the sun, especially in order to become brown Her mother was sunbathing in the back garden. ► There is no noun ‘sunbath’: Let’s go and sunbathe/do some sunbathing (NOT have a sunbath).→ See Verb table
Examples from the Corpus
sunbathe• Ian and Vicki decide to explore as far as the next hill, leaving Barbara and the Doctor behind to sunbathe.• The beach is all of fifty metres away across the road and is great for lazy days sunbathing.• Now when I am at the pool, I can sunbathe and read and doze.• In the afternoons they sunbathed and swam.• If you haven't got time to sunbathe, Coppertone's Sudden Tan could be the answer.• A man in Pripyat sunbathed on his balcony throughout the next day.• Meanwhile, the less energetic can sunbathe on the shores of the pretty Lansersee.• It transpired that there was a secluded roof on her house where she was wont to sunbathe totally naked. 