cat flap

Từ điển Oxford Advanced Learner 8th

ˈcat flap f11 [cat flap cat flaps] BrE NAmE (BrE) (NAmE ˈcat door) noun
a hole cut in the bottom of the door to a house, covered by a piece of plastic that swings, so a pet cat can go in and out
See also: ↑cat door