1. [mid-18C–1930s] an eye; often in pl.
2. [1990s+] a look.
3. (Aus.) a peepshow.
[1960s+] (US) a voyeur.
[1960s] (US) a striptease club or place where women pose in booths covered by screens which can be opened for set periods by coin-in-the-slot payments.
[1900s] (US) at a glance.
see peel one’s peepers under peeper n.
[1930s–40s] (US black) to look around one’s immediate environs.
[1940s] (US) to run surveillance on.