German

Verb

im Auge behalten

1. (idiomatic, transitive) to keep an eye on
   • 2012 June 12, Die Welt , page 22:

     Menschen mit erhöhtem Risiko für multiple Sklerose (MS) sind gut beraten, ihren Vitamin-D-Spiegel im Auge zu behalten

     People with a higher risk of multiple sclerosis (MS) are well-advised to keep an eye on their vitamin D level