Meaning of “double (up) as sth” in the English Dictionary

british dictionary

"double (up) as sth" in British English

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double (up) as sth

phrasal verb with double uk /ˈdʌb.əl/ us /ˈdʌb.əl/ 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 an office for Dan when he's working at home.

(Definition of “double (up) as sth” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)