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
Cece	SEE-see	English
Pamphilos	-	Ancient Greek
Sujay	-	Bengali, Indian, Marathi
Shakira	-	Arabic
Marcel	mar-SEL (French), MAHR-tsel (Polish), MAHR-sel (Dutch, German)	French, Catalan, Romanian, Polish, Czech, Slovak, Dutch, German
Lizzie	LIZ-ee	English