Peep is a commonly used verb that means to take a quick or secretive look. However, if you find yourself in a situation where you don't want to use "peep" repeatedly, there are several synonyms to choose from. For instance, you may use "glimpse," which means a momentary look or sight. Alternatively, you may use "peek", a quick or furtive glance or "spy" which means to observe secretly. "Sneak" is another synonym, and it means to move around quietly and secretly. Lastly, you may use the term "ogle," which means to stare at someone or something with desire or curiosity.