словарь немецкий - английский
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sich sonnen на английском языке:
1. 
sunbathe
We sunbathed every day.
This beach is a good place to sunbathe.
You shouldn’t sunbathe at midday. The sun is too hot then.
I like to sunbathe
2. 
sun oneself
Английский слово "sich sonnen«(sun oneself) встречается в наборах:
Reflexive Verben3. 
sunbathing
Let's go sunbathing.
I like sunbathing in the morning when the sun is not so hot.
to take a sunbath 