a hole (in a door or an oven etc) through which you can peep
例句
用作名词 (n.)
He squinted through the peephole. 他眯起眼睛靠近窥视孔看了看。
But the instant she closed the door, she peered through the peephole and saw he was still standing by the gate. 然而,她刚一关上房门,就迫不及待地从门镜中向外望去,只见他仍然站在外面的大门旁。