do duty as

do (double) duty as/for something

(American & Australian)

to also have another purpose They make an electronic identity card that will do duty for a credit card and pocket calculator. She's really the secretary but she does double duty as the receptionist during Katrina's lunch hour.

Common Names:

Name	Pronounced	Usage
Filip	FEE-lip (Dutch), FEE-leep (Polish, Finnish)	Swedish, Norwegian, Danish, Dutch, Czech, Slovak, Bulgarian, Polish, Croatian, Serbian, Slovene, Mac
Aatami	AH:-tah-mee	Finnish
Manana	-	Georgian
Nastya	-	Russian
Amihan	-	Filipino, Hiligaynon
Porphyrios	-	Ancient Greek