ˈsoap ˌopera noun [countable]
[Date: 1900-2000; Origin: Because they were originally sponsored by soap-making companies]
a television or radio story about the daily lives and relationships of the same group of people, which is broadcast regularly

[TahlilGaran] Dictionary of Contemporary English ▲

soap opera
n. phr. Radio or television serialized stories of a sentimental nature, often involving sex, crime, and social intrigue. These shows often advertise soap products, hence their name.
The two longest running soap operas in the United States were "Dallas" and "Knot's Landing."

[TahlilGaran] English Idioms Dictionary ▲