double duty

dou·ble-du·ty

[duhb-uhl-doo-tee, -dyoo-]
adjective
designed to fill two functions: double-duty tools.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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American Heritage
Idioms & Phrases

double duty

Fulfilling two functions at the same time, as in Our pickup truck does double duty, since it is used for the business and for family outings.

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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00:10
Double duty is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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