do double duty

do double duty

1. to do two jobs at one time Kudrow does double duty in the show, playing her regular role and the character's twin sister.
2. to be used for two different activities Three conference rooms do double duty as dining rooms when the main dining room is full.
See also: double, duty
References in periodicals archive ?
With the ProPulse system, vehicles can do double duty as on-site power sources.