to peep; to peek; to act as voyeur

to pry into or spy on; to snoop; to peep; to poke one's nose into; to peer; to get a glimpse of

to peep at; to spy on; to peek

voyeur; peeping tom

to spy upon; to lie in wait for (an opportunity)

to peep; to spy on

to find out about; to discover

to catch a glimpse of

lit. to see one spot on a leopard; fig. a restricted view

to look at sth through a bamboo tube; to have a restricted view

to peep at

endoscope

to infer easily; to guess at a glance; to get a clue

lit. not even peek at the garden; fig. to be absorbed in one's studies (idiom)

lit. see one spot on a leopard (idiom); fig. a restricted view

lit. to see a leopard through a narrow tube (idiom); fig. to miss the big picture

in my humble opinion