to peep

to pry into or spy on

to catch a glimpse of

to look at sth through a bamboo tube

to peep

to find out about

(verb) to peep; to glimpse

endoscope

to peep at

to peep

to peep at

lit. to see one spot on a leopard

to spy upon

voyeur

in my humble opinion

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

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

lit. not even peek at the garden

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

A man should not covet his friend's wife or girlfriend; A friend's wife or girlfriend is not to be flirted with.