sunbathe
verb
ˈsʌnbeɪð 
ˈsʌnbeɪð to sit or lie in the sun, especially in order to go brown (get a suntan )
We spent the day sunbathing and swimming.
Usage note: bath / bathe / swim / sunbatheWhen you wash yourself you can say that you bath (British English) or bathe (North American English) , but it is much more common to say have a bath (British English) or take a bath (North American English).You can also bath (British English) or bathe (North American English) another person, for example a baby.You bathe a part of your body, especially to clean a wound.When you go swimming it is old-fashioned to say that you bathe, and you cannot say that you bath or take a bath. It is more common to swim, go for a swim, have a swim or go swimming: Let’s go for a quick swim in the pool. ◇ She goes swimming every morning before breakfast. What you wear for this activity is usually called a swimming costume in British English and a bathing suit in North American English.When you lie in the sun in order to go brown you sunbathe.