backup dancer
US /ˈbæk.ʌp ˌdæn.sər/
UK /ˈbæk.ʌp ˌdæn.sər/
1.
a dancer who performs with a lead singer or group, often in the background, to enhance a live performance or music video
:
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She started her career as a backup dancer for a famous pop star.
•
The concert featured elaborate choreography with many backup dancers.