double as (someone or something)
To serve two separate purposes. Because we're understaffed, I have to double as receptionist and file clerk right now. You wouldn't know from looking at it, but this sleeping bag actually doubles as a poncho.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
double as someone or something
[for someone] to serve in two capacities. The chairman will have to double as CEO until we find a new one. This table doubles as a desk during busy times.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
To serve in some additional capacity: The high school principal doubles as the soccer coach.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.