As a Noun: 1. With reference to infectious diseases, especially COVID-19, the period of time a regulation or law which obliges anyone who has the infection or is a near- or direct-contact to isolate at home to avoid infecting others. English = home isolation, self-isolation, quarantine. As a Verb or Adjective: 1. With reference to infectious diseases, especially COVID-19, to stay at home for a period of time to avoid infecting others because a regulation or law obliges you to do so. English = home isolate, self-isolate, quarantine. Note: 1. Suggested sign #1 2.