double in brass

Of theatrical origin: some actors were also able to assist in the orchestra.

double in brass (third-person singular simple present doubles in brass, present participle doubling in brass, simple past and past participle doubled in brass)

1. To perform two or more tasks within the same project or organization.
   • 2013, O. C. Edwards, Runagates in Scarceness: A Holy Mystery, page 21:

     Angela, like several of the Chase faculty, had to double in brass and offer the seminary's few courses in an academic field other than her specialized area of ethics and moral theology.