sunbathe

Từ điển Oxford Advanced Learner 8th

sun·bathe [sunbathe sunbathes sunbathed sunbathing] BrE [ˈsʌnbeɪð] NAmE [ˈsʌnbeɪð] verb intransitive
to sit or lie in the sun, especially in order to go brown (get a ↑suntan )
•We spent the day sunbathing and swimming.
Verb forms:

Which Word?:
bath / bathe / swim / sunbathe
When you wash yourself you can say that you bath (BrE) or bathe (NAmE), but it is much more common to say have a bath (BrE) or take a bath (NAmE).
You can also bath (BrE) or bathe (NAmE) 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 BrE and a bathing suit in NAmE.
When you lie in the sun in order to go brown you sunbathe.