This is the 7872nd most frequent Russian word.
карантин
Quarantine.
The word 'карантин' refers to the restrictive measures taken to isolate individuals in order to control the spread of a disease.
Карантин был введён для предотвращения распространения болезни.
Quarantine was implemented to prevent the spread of the disease.
Here, 'карантин' describes the period during which restrictions are in place and people stay isolated.
Во время карантина я начал учить новый язык.
During the quarantine, I started learning a new language.
In this sentence, 'карантин' is used to indicate the state of restrictions due to health regulations.