noun
General term for a rear door of a building or vehicle; also used for the tailgate of a station wagon or SUV.
その店のバックドアから入ってください。
Please enter through the back door of the shop.
車のバックドアを開けて荷物を積んだ。
I opened the tailgate and loaded the luggage.
noun
backdoor (computing)
In computing, a hidden method of bypassing normal authentication or encryption in a system.
ハッカーがシステムにバックドアを仕掛けた。
The hacker installed a backdoor in the system.
noun
backdoor pitch (baseball)
In baseball, a pitch that appears to be outside the strike zone but catches the edge of the plate, often used for a strike.
ピッチャーはバックドアのスライダーで三振を取った。
The pitcher struck the batter out with a backdoor slider.