The phrase "double duty of" is grammatically correct and can be used in written English
It means that something is performing two roles or tasks at the same time. Example: "Jenny's multitasking skills were put to the test as she took on the double duty of being both the team leader and the event coordinator for the company picnic."
East Village Actually, many of the area's institutions do double duty of various kinds.
We are a small, close-knit community, in part because night work can be so challenging and very few researchers are willing to do the double duty of marking trails all day and then forgoing sleep at night to survey.
Once building codes, architect requirements, and grid regulations, includes PV solar as THE standard for any new house, the installation costs will come down drastically; maybe even surpass large scale PV solar installations because of the double duty of the roof (one example).
She noted that there were more stringent guidelines for helping people with money from the Neediest Cases Fund than with the money earmarked for victims of 9/11, because this year the Neediest Cases Fund had to do the double duty of helping trade center victims and those in poverty.
The four-mic array flanks the lens on either side, doing double duty of listening to commands and noise canceling during chats.
They do double duty of both allowing the monkey to control the arms with their thoughts, while allowing the scientists to monitor changes to an area of the brain long ago rewired by amputation.
With a few tweaks, the design could easily do double duty for a production of Mozart's beloved opera "The Marriage of Figaro".
The first came as soon as the curtain rose on Derek McLane's set, a sumptuous interior of a New York house on Washington Square (with a lovely Irish maid, played by Virginia Kull, lighting a chandelier) that might do double duty for an episode of Masterpiece's silver-plated hit "Downton Abbey".
DOUBLE DUTY One of the busiest stars during upfront week was Seth Meyers, who performed at two presentations.
Also did double duty much of the time, playing safety for the Knights and tallying 25 tackles.
"Sometimes it's the double-duty of texting and looking down that causes the curve in your neck to get lost and get flat". Mind your footwear.
