do duty as

phrase

1
: to do the work of (someone or something)
did duty as guard
2
: to be used as (something)
The backpack she uses at school also does duty as an overnight bag.

Examples of do duty as in a Sentence

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That challenge was made easier by giving the girls the lavish space that would ordinarily do duty as the master bedroom. — Julia Reed, ELLE Decor, 21 Mar. 2023 Pieces like this Swedish vintage dressing table, which can do duty as a desk or entry table, are prized for their flexibility. — Michelle Slatalla, WSJ, 4 Feb. 2022

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“Do duty as.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/do%20duty%20as. Accessed 7 Oct. 2026.

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