do (double) duty(redirected from do duty)
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.