loose cover

noun
🔊/ˌluːs ˈkʌvə(r)/
🔊/ˌluːs ˈkʌvər/
(British English)
(North American English slipcover)
[usually plural]
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  1. a cover for a chair, etc. that you can take off, for example to wash it(椅子等的)活套,活罩