popular dance music (especially in the late 1970s); melodic with a regular bass beat; intended mainly for dancing at discotheques
"The club was packed as everyone danced to the catchy, bass-heavy disco hits that defined the era."
a public dance hall for dancing to recorded popular music
"The crowd packed into the disco, swaying to the rhythm of the records playing from the large speakers."
Clipping of discotheque, a nightclub for dancing.
"The crowd danced all night at the local disco until sunrise."
In plain English: Disco is a type of popular music and dance style from the 1970s that features upbeat rhythms played at parties with flashing lights.
"They danced all night at the disco until early morning."
dance to disco music
"She decided to go out and dance to disco music at the club on Saturday night."
To dance disco-style dances.
"The crowd began to disco as the upbeat music filled the club."
In plain English: To disco means to dance energetically, usually by moving your hips and shaking your body to music.
"The club was so packed that everyone had to disco through the narrow hallway just to get inside."
The word disco is simply a shortened version of the French term discothèque. It entered English as an abbreviation for this original phrase rather than retaining its full form in common usage.