double-duty

[ duhb-uh l-doo-tee, -dyoo- ]
/ ˈdʌb əlˈdu ti, -ˈdyu- /

adjective

designed to fill two functions: double-duty tools.

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“Compliment” and “complement” had a shared meaning a long time ago, but today they are no longer interchangeable.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Idioms and Phrases with double duty

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® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.