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English definition of “double (up) as sth”

double (up) as sth

phrasal verb with double     /ˈdʌb.l̩/ verb [I or T]
to be also used as something else: The kitchen table doubles as my desk when I'm writing. Our spare bedroom doubles up as a study for Dan when he's working at home.Single, double and multiple
(Definition of double (up) as sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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