kitchen door; back door; service entrance
Refers to a secondary entrance to a house, typically near the kitchen, used by family or tradespeople rather than guests.
Delivery people, please come in through the service entrance.
I forgot to lock the back door.
host's entrance to a tea-ceremony room
Specific term in tea ceremony; the small door through which the host enters the tea room. Also called 茶道口.
See also: 茶道口
In the tea room, the host enters through the host's entrance.