avoid somebody/something like the plague
avoid (someone or something) like the plague
To consciously stay away from someone or something. I didn't do my homework my last night, so I'm avoiding my teacher like the plague. My dog is terrified of cats and avoids them like the plague.
avoid someone or something like the plague
Fig. to ignore or keep away from someone or something totally. What's wrong with Bob? Everyone avoids him like the plague. I don't like opera. I avoid it like the plague.
avoid like the plague
Evade or elude at any cost, shun. For example, Since Bob was taken into police custody, his friends have been avoiding him and his family like the plague . This seemingly modern expression dates from the Latin of the early Middle Ages, when Saint Jerome (a.d. 345-420) wrote, "Avoid, as you would the plague, a clergyman who is also a man of business." The plague, a deadly infectious disease in his day, has been largely wiped out, but the term remains current.
avoid somebody/something like the ˈplague(informal) avoid somebody/something completely: It was the sort of restaurant that I would normally have avoided like the plague.
A plague is an infectious disease that kills a lot of people.