…look quickly and furtively at something, especially through a narrow opening…
…a sequence of pictures viewed through a lens or hole set into a box, formerly offered as a public entertainment…
…(of a shoe) having the tip cut away to leave the large toe partially exposed…
…a backsight for rifles with a circular hole through which the foresight is brought into line with the object aimed at…
…a small hole that may be looked through, especially one in a door through which callers may be identified before the door is opened…
