This is the 15239th most frequent German word.
umkreisen
"Umkreisen" means "to circle" or "to orbit."
Here, 'umkreisen' is used in its literal sense to describe the Earth's orbit around the Sun.
Die Erde umkreist die Sonne in einem Jahr.
The Earth orbits the Sun in a year.
In this sentence, 'umkreisen' is used metaphorically to indicate surrounding or encircling someone.
Die Polizei umkreiste den Verdächtigen, um ihn einzufangen.
The police surrounded the suspect to capture him.
In this context, 'umkreisen' is used to describe thoughts metaphorically revolving or circling around a concern.