backup dancer
US /ˈbæk.ʌp ˌdæn.sər/
UK /ˈbæk.ʌp ˌdæn.sər/

1.
bailarín de apoyo, bailarina de apoyo
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.
Ella comenzó su carrera como bailarina de apoyo para una famosa estrella del pop.
•
The concert featured elaborate choreography with many backup dancers.
El concierto contó con una elaborada coreografía con muchos bailarines de apoyo.