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cat door

noun
🔊/ˈkæt dɔː(r)/
🔊/ˈkæt dɔːr/
(North American English)
(British English cat flap)
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  1. a hole cut in the bottom of the door to a house, covered by a piece of plastic that moves freely, so a pet cat can go in and out（门下供家猫进出的）活动板猫洞