do (double) duty

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do (double) duty

1. To do two things simultaneously. It's sometimes tough to do double duty as an accountant and a mom, but we really needed a second income.
2. To be able to serve two functions. Don't worry, this space can do double duty as a guest room and an office.
See also: duty
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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References in periodicals archive ?
Buttons for those programs are also located on a bar above the F keys, which now do double duty as e-mail keys (Reply, Forward, Send), in addition to opening the Task Pane (a new feature in Office XP; see the review "No Small Task," Techwatch, November 2001).