do (double) duty as (something)

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do (double) duty as (something)

1. To do two things simultaneously. It's sometimes tough to do double duty as an accountant and 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
References in periodicals archive ?
Concrete benches and bent steel posts are scattered across the piazza, doing double duty as seating and security barriers.
(ENI)--England's historic parish churches will soon be doing double duty as hosts for telecom antennae as phone companies set up third-generation mobile phone networks which allow for Internet access.